platform/kernel/linux-amlogic.git
4 years agovti4: eliminated some duplicate code.
Jeremy Sowden [Sat, 23 Mar 2019 14:43:02 +0000 (14:43 +0000)]
vti4: eliminated some duplicate code.

commit f981c57ffd2d7cf2dd4b6d6f8fcb3965df42f54c upstream.

The ipip tunnel introduced in commit dd9ee3444014 ("vti4: Fix a ipip
packet processing bug in 'IPCOMP' virtual tunnel") largely duplicated
the existing vti_input and vti_recv functions.  Refactored to
deduplicate the common code.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoxfrm: fix a NULL-ptr deref in xfrm_local_error
Xin Long [Tue, 26 May 2020 09:41:46 +0000 (17:41 +0800)]
xfrm: fix a NULL-ptr deref in xfrm_local_error

commit f6a23d85d078c2ffde79c66ca81d0a1dde451649 upstream.

This patch is to fix a crash:

  [ ] kasan: GPF could be caused by NULL-ptr deref or user memory access
  [ ] general protection fault: 0000 [#1] SMP KASAN PTI
  [ ] RIP: 0010:ipv6_local_error+0xac/0x7a0
  [ ] Call Trace:
  [ ]  xfrm6_local_error+0x1eb/0x300
  [ ]  xfrm_local_error+0x95/0x130
  [ ]  __xfrm6_output+0x65f/0xb50
  [ ]  xfrm6_output+0x106/0x46f
  [ ]  udp_tunnel6_xmit_skb+0x618/0xbf0 [ip6_udp_tunnel]
  [ ]  vxlan_xmit_one+0xbc6/0x2c60 [vxlan]
  [ ]  vxlan_xmit+0x6a0/0x4276 [vxlan]
  [ ]  dev_hard_start_xmit+0x165/0x820
  [ ]  __dev_queue_xmit+0x1ff0/0x2b90
  [ ]  ip_finish_output2+0xd3e/0x1480
  [ ]  ip_do_fragment+0x182d/0x2210
  [ ]  ip_output+0x1d0/0x510
  [ ]  ip_send_skb+0x37/0xa0
  [ ]  raw_sendmsg+0x1b4c/0x2b80
  [ ]  sock_sendmsg+0xc0/0x110

This occurred when sending a v4 skb over vxlan6 over ipsec, in which case
skb->protocol == htons(ETH_P_IPV6) while skb->sk->sk_family == AF_INET in
xfrm_local_error(). Then it will go to xfrm6_local_error() where it tries
to get ipv6 info from a ipv4 sk.

This issue was actually fixed by Commit 628e341f319f ("xfrm: make local
error reporting more robust"), but brought back by Commit 844d48746e4b
("xfrm: choose protocol family by skb protocol").

So to fix it, we should call xfrm6_local_error() only when skb->protocol
is htons(ETH_P_IPV6) and skb->sk->sk_family is AF_INET6.

Fixes: 844d48746e4b ("xfrm: choose protocol family by skb protocol")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoxfrm: fix a warning in xfrm_policy_insert_list
Xin Long [Mon, 25 May 2020 05:53:37 +0000 (13:53 +0800)]
xfrm: fix a warning in xfrm_policy_insert_list

commit ed17b8d377eaf6b4a01d46942b4c647378a79bdd upstream.

This waring can be triggered simply by:

  # ip xfrm policy update src 192.168.1.1/24 dst 192.168.1.2/24 dir in \
    priority 1 mark 0 mask 0x10  #[1]
  # ip xfrm policy update src 192.168.1.1/24 dst 192.168.1.2/24 dir in \
    priority 2 mark 0 mask 0x1   #[2]
  # ip xfrm policy update src 192.168.1.1/24 dst 192.168.1.2/24 dir in \
    priority 2 mark 0 mask 0x10  #[3]

Then dmesg shows:

  [ ] WARNING: CPU: 1 PID: 7265 at net/xfrm/xfrm_policy.c:1548
  [ ] RIP: 0010:xfrm_policy_insert_list+0x2f2/0x1030
  [ ] Call Trace:
  [ ]  xfrm_policy_inexact_insert+0x85/0xe50
  [ ]  xfrm_policy_insert+0x4ba/0x680
  [ ]  xfrm_add_policy+0x246/0x4d0
  [ ]  xfrm_user_rcv_msg+0x331/0x5c0
  [ ]  netlink_rcv_skb+0x121/0x350
  [ ]  xfrm_netlink_rcv+0x66/0x80
  [ ]  netlink_unicast+0x439/0x630
  [ ]  netlink_sendmsg+0x714/0xbf0
  [ ]  sock_sendmsg+0xe2/0x110

The issue was introduced by Commit 7cb8a93968e3 ("xfrm: Allow inserting
policies with matching mark and different priorities"). After that, the
policies [1] and [2] would be able to be added with different priorities.

However, policy [3] will actually match both [1] and [2]. Policy [1]
was matched due to the 1st 'return true' in xfrm_policy_mark_match(),
and policy [2] was matched due to the 2nd 'return true' in there. It
caused WARN_ON() in xfrm_policy_insert_list().

This patch is to fix it by only (the same value and priority) as the
same policy in xfrm_policy_mark_match().

Thanks to Yuehaibing, we could make this fix better.

v1->v2:
  - check policy->mark.v == pol->mark.v only without mask.

Fixes: 7cb8a93968e3 ("xfrm: Allow inserting policies with matching mark and different priorities")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoxfrm: allow to accept packets with ipv6 NEXTHDR_HOP in xfrm_input
Xin Long [Fri, 10 Apr 2020 09:06:01 +0000 (17:06 +0800)]
xfrm: allow to accept packets with ipv6 NEXTHDR_HOP in xfrm_input

commit afcaf61be9d1dbdee5ec186d1dcc67b6b692180f upstream.

For beet mode, when it's ipv6 inner address with nexthdrs set,
the packet format might be:

    ----------------------------------------------------
    | outer  |     | dest |     |      |  ESP    | ESP |
    | IP hdr | ESP | opts.| TCP | Data | Trailer | ICV |
    ----------------------------------------------------

The nexthdr from ESP could be NEXTHDR_HOP(0), so it should
continue processing the packet when nexthdr returns 0 in
xfrm_input(). Otherwise, when ipv6 nexthdr is set, the
packet will be dropped.

I don't see any error cases that nexthdr may return 0. So
fix it by removing the check for nexthdr == 0.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agox86/dma: Fix max PFN arithmetic overflow on 32 bit systems
Alexander Dahl [Tue, 26 May 2020 17:57:49 +0000 (19:57 +0200)]
x86/dma: Fix max PFN arithmetic overflow on 32 bit systems

commit 88743470668ef5eb6b7ba9e0f99888e5999bf172 upstream.

The intermediate result of the old term (4UL * 1024 * 1024 * 1024) is
4 294 967 296 or 0x100000000 which is no problem on 64 bit systems.
The patch does not change the later overall result of 0x100000 for
MAX_DMA32_PFN (after it has been shifted by PAGE_SHIFT). The new
calculation yields the same result, but does not require 64 bit
arithmetic.

On 32 bit systems the old calculation suffers from an arithmetic
overflow in that intermediate term in braces: 4UL aka unsigned long int
is 4 byte wide and an arithmetic overflow happens (the 0x100000000 does
not fit in 4 bytes), the in braces result is truncated to zero, the
following right shift does not alter that, so MAX_DMA32_PFN evaluates to
0 on 32 bit systems.

That wrong value is a problem in a comparision against MAX_DMA32_PFN in
the init code for swiotlb in pci_swiotlb_detect_4gb() to decide if
swiotlb should be active.  That comparison yields the opposite result,
when compiling on 32 bit systems.

This was not possible before

  1b7e03ef7570 ("x86, NUMA: Enable emulation on 32bit too")

when that MAX_DMA32_PFN was first made visible to x86_32 (and which
landed in v3.0).

In practice this wasn't a problem, unless CONFIG_SWIOTLB is active on
x86-32.

However if one has set CONFIG_IOMMU_INTEL, since

  c5a5dc4cbbf4 ("iommu/vt-d: Don't switch off swiotlb if bounce page is used")

there's a dependency on CONFIG_SWIOTLB, which was not necessarily
active before. That landed in v5.4, where we noticed it in the fli4l
Linux distribution. We have CONFIG_IOMMU_INTEL active on both 32 and 64
bit kernel configs there (I could not find out why, so let's just say
historical reasons).

The effect is at boot time 64 MiB (default size) were allocated for
bounce buffers now, which is a noticeable amount of memory on small
systems like pcengines ALIX 2D3 with 256 MiB memory, which are still
frequently used as home routers.

We noticed this effect when migrating from kernel v4.19 (LTS) to v5.4
(LTS) in fli4l and got that kernel messages for example:

  Linux version 5.4.22 (buildroot@buildroot) (gcc version 7.3.0 (Buildroot 2018.02.8)) #1 SMP Mon Nov 26 23:40:00 CET 2018
  …
  Memory: 183484K/261756K available (4594K kernel code, 393K rwdata, 1660K rodata, 536K init, 456K bss , 78272K reserved, 0K cma-reserved, 0K highmem)
  …
  PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
  software IO TLB: mapped [mem 0x0bb78000-0x0fb78000] (64MB)

The initial analysis and the suggested fix was done by user 'sourcejedi'
at stackoverflow and explicitly marked as GPLv2 for inclusion in the
Linux kernel:

  https://unix.stackexchange.com/a/520525/50007

The new calculation, which does not suffer from that overflow, is the
same as for arch/mips now as suggested by Robin Murphy.

The fix was tested by fli4l users on round about two dozen different
systems, including both 32 and 64 bit archs, bare metal and virtualized
machines.

 [ bp: Massage commit message. ]

Fixes: 1b7e03ef7570 ("x86, NUMA: Enable emulation on 32bit too")
Reported-by: Alan Jenkins <alan.christopher.jenkins@gmail.com>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Alexander Dahl <post@lespocky.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
Link: https://unix.stackexchange.com/q/520065/50007
Link: https://web.nettworks.org/bugs/browse/FFL-2560
Link: https://lkml.kernel.org/r/20200526175749.20742-1-post@lespocky.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agomac80211: mesh: fix discovery timer re-arming issue / crash
Linus Lüssing [Fri, 22 May 2020 17:04:13 +0000 (19:04 +0200)]
mac80211: mesh: fix discovery timer re-arming issue / crash

commit e2d4a80f93fcfaf72e2e20daf6a28e39c3b90677 upstream.

On a non-forwarding 802.11s link between two fairly busy
neighboring nodes (iperf with -P 16 at ~850MBit/s TCP;
1733.3 MBit/s VHT-MCS 9 80MHz short GI VHT-NSS 4), so with
frequent PREQ retries, usually after around 30-40 seconds the
following crash would occur:

[ 1110.822428] Unable to handle kernel read from unreadable memory at virtual address 00000000
[ 1110.830786] Mem abort info:
[ 1110.833573]   Exception class = IABT (current EL), IL = 32 bits
[ 1110.839494]   SET = 0, FnV = 0
[ 1110.842546]   EA = 0, S1PTW = 0
[ 1110.845678] user pgtable: 4k pages, 48-bit VAs, pgd = ffff800076386000
[ 1110.852204] [0000000000000000] *pgd=00000000f6322003, *pud=00000000f62de003, *pmd=0000000000000000
[ 1110.861167] Internal error: Oops: 86000004 [#1] PREEMPT SMP
[ 1110.866730] Modules linked in: pppoe ppp_async batman_adv ath10k_pci ath10k_core ath pppox ppp_generic nf_conntrack_ipv6 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_FLOWOFFLOAD slhc nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache nf_conntrack iptable_mangle iptable_filter ip_tables crc_ccitt compat nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 usb_storage xhci_plat_hcd xhci_pci xhci_hcd dwc3 usbcore usb_common
[ 1110.932190] Process swapper/3 (pid: 0, stack limit = 0xffff0000090c8000)
[ 1110.938884] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.14.162 #0
[ 1110.944965] Hardware name: LS1043A RGW Board (DT)
[ 1110.949658] task: ffff8000787a81c0 task.stack: ffff0000090c8000
[ 1110.955568] PC is at 0x0
[ 1110.958097] LR is at call_timer_fn.isra.27+0x24/0x78
[ 1110.963055] pc : [<0000000000000000>] lr : [<ffff0000080ff29c>] pstate: 00400145
[ 1110.970440] sp : ffff00000801be10
[ 1110.973744] x29: ffff00000801be10 x28: ffff000008bf7018
[ 1110.979047] x27: ffff000008bf87c8 x26: ffff000008c160c0
[ 1110.984352] x25: 0000000000000000 x24: 0000000000000000
[ 1110.989657] x23: dead000000000200 x22: 0000000000000000
[ 1110.994959] x21: 0000000000000000 x20: 0000000000000101
[ 1111.000262] x19: ffff8000787a81c0 x18: 0000000000000000
[ 1111.005565] x17: ffff0000089167b0 x16: 0000000000000058
[ 1111.010868] x15: ffff0000089167b0 x14: 0000000000000000
[ 1111.016172] x13: ffff000008916788 x12: 0000000000000040
[ 1111.021475] x11: ffff80007fda9af0 x10: 0000000000000001
[ 1111.026777] x9 : ffff00000801bea0 x8 : 0000000000000004
[ 1111.032080] x7 : 0000000000000000 x6 : ffff80007fda9aa8
[ 1111.037383] x5 : ffff00000801bea0 x4 : 0000000000000010
[ 1111.042685] x3 : ffff00000801be98 x2 : 0000000000000614
[ 1111.047988] x1 : 0000000000000000 x0 : 0000000000000000
[ 1111.053290] Call trace:
[ 1111.055728] Exception stack(0xffff00000801bcd0 to 0xffff00000801be10)
[ 1111.062158] bcc0:                                   0000000000000000 0000000000000000
[ 1111.069978] bce0: 0000000000000614 ffff00000801be98 0000000000000010 ffff00000801bea0
[ 1111.077798] bd00: ffff80007fda9aa8 0000000000000000 0000000000000004 ffff00000801bea0
[ 1111.085618] bd20: 0000000000000001 ffff80007fda9af0 0000000000000040 ffff000008916788
[ 1111.093437] bd40: 0000000000000000 ffff0000089167b0 0000000000000058 ffff0000089167b0
[ 1111.101256] bd60: 0000000000000000 ffff8000787a81c0 0000000000000101 0000000000000000
[ 1111.109075] bd80: 0000000000000000 dead000000000200 0000000000000000 0000000000000000
[ 1111.116895] bda0: ffff000008c160c0 ffff000008bf87c8 ffff000008bf7018 ffff00000801be10
[ 1111.124715] bdc0: ffff0000080ff29c ffff00000801be10 0000000000000000 0000000000400145
[ 1111.132534] bde0: ffff8000787a81c0 ffff00000801bde8 0000ffffffffffff 000001029eb19be8
[ 1111.140353] be00: ffff00000801be10 0000000000000000
[ 1111.145220] [<          (null)>]           (null)
[ 1111.149917] [<ffff0000080ff77c>] run_timer_softirq+0x184/0x398
[ 1111.155741] [<ffff000008081938>] __do_softirq+0x100/0x1fc
[ 1111.161130] [<ffff0000080a2e28>] irq_exit+0x80/0xd8
[ 1111.166002] [<ffff0000080ea708>] __handle_domain_irq+0x88/0xb0
[ 1111.171825] [<ffff000008081678>] gic_handle_irq+0x68/0xb0
[ 1111.177213] Exception stack(0xffff0000090cbe30 to 0xffff0000090cbf70)
[ 1111.183642] be20:                                   0000000000000020 0000000000000000
[ 1111.191461] be40: 0000000000000001 0000000000000000 00008000771af000 0000000000000000
[ 1111.199281] be60: ffff000008c95180 0000000000000000 ffff000008c19360 ffff0000090cbef0
[ 1111.207101] be80: 0000000000000810 0000000000000400 0000000000000098 ffff000000000000
[ 1111.214920] bea0: 0000000000000001 ffff0000089167b0 0000000000000000 ffff0000089167b0
[ 1111.222740] bec0: 0000000000000000 ffff000008c198e8 ffff000008bf7018 ffff000008c19000
[ 1111.230559] bee0: 0000000000000000 0000000000000000 ffff8000787a81c0 ffff000008018000
[ 1111.238380] bf00: ffff00000801c000 ffff00000913ba34 ffff8000787a81c0 ffff0000090cbf70
[ 1111.246199] bf20: ffff0000080857cc ffff0000090cbf70 ffff0000080857d0 0000000000400145
[ 1111.254020] bf40: ffff000008018000 ffff00000801c000 ffffffffffffffff ffff0000080fa574
[ 1111.261838] bf60: ffff0000090cbf70 ffff0000080857d0
[ 1111.266706] [<ffff0000080832e8>] el1_irq+0xe8/0x18c
[ 1111.271576] [<ffff0000080857d0>] arch_cpu_idle+0x10/0x18
[ 1111.276880] [<ffff0000080d7de4>] do_idle+0xec/0x1b8
[ 1111.281748] [<ffff0000080d8020>] cpu_startup_entry+0x20/0x28
[ 1111.287399] [<ffff00000808f81c>] secondary_start_kernel+0x104/0x110
[ 1111.293662] Code: bad PC value
[ 1111.296710] ---[ end trace 555b6ca4363c3edd ]---
[ 1111.301318] Kernel panic - not syncing: Fatal exception in interrupt
[ 1111.307661] SMP: stopping secondary CPUs
[ 1111.311574] Kernel Offset: disabled
[ 1111.315053] CPU features: 0x0002000
[ 1111.318530] Memory Limit: none
[ 1111.321575] Rebooting in 3 seconds..

With some added debug output / delays we were able to push the crash from
the timer callback runner into the callback function and by that shedding
some light on which object holding the timer gets corrupted:

[  401.720899] Unable to handle kernel read from unreadable memory at virtual address 00000868
[...]
[  402.335836] [<ffff0000088fafa4>] _raw_spin_lock_bh+0x14/0x48
[  402.341548] [<ffff000000dbe684>] mesh_path_timer+0x10c/0x248 [mac80211]
[  402.348154] [<ffff0000080ff29c>] call_timer_fn.isra.27+0x24/0x78
[  402.354150] [<ffff0000080ff77c>] run_timer_softirq+0x184/0x398
[  402.359974] [<ffff000008081938>] __do_softirq+0x100/0x1fc
[  402.365362] [<ffff0000080a2e28>] irq_exit+0x80/0xd8
[  402.370231] [<ffff0000080ea708>] __handle_domain_irq+0x88/0xb0
[  402.376053] [<ffff000008081678>] gic_handle_irq+0x68/0xb0

The issue happens due to the following sequence of events:

1) mesh_path_start_discovery():
-> spin_unlock_bh(&mpath->state_lock) before mesh_path_sel_frame_tx()

2) mesh_path_free_rcu()
-> del_timer_sync(&mpath->timer)
   [...]
-> kfree_rcu(mpath)

3) mesh_path_start_discovery():
-> mod_timer(&mpath->timer, ...)
   [...]
-> rcu_read_unlock()

4) mesh_path_free_rcu()'s kfree_rcu():
-> kfree(mpath)

5) mesh_path_timer() starts after timeout, using freed mpath object

So a use-after-free issue due to a timer re-arming bug caused by an
early spin-unlocking.

This patch fixes this issue by re-checking if mpath is about to be
free'd and if so bails out of re-arming the timer.

Cc: stable@vger.kernel.org
Fixes: 050ac52cbe1f ("mac80211: code for on-demand Hybrid Wireless Mesh Protocol")
Cc: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Linus Lüssing <ll@simonwunderlich.de>
Link: https://lore.kernel.org/r/20200522170413.14973-1-linus.luessing@c0d3.blue
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoparisc: Fix kernel panic in mem_init()
Helge Deller [Thu, 28 May 2020 20:29:25 +0000 (22:29 +0200)]
parisc: Fix kernel panic in mem_init()

commit bf71bc16e02162388808949b179d59d0b571b965 upstream.

The Debian kernel v5.6 triggers this kernel panic:

 Kernel panic - not syncing: Bad Address (null pointer deref?)
 Bad Address (null pointer deref?): Code=26 (Data memory access rights trap) at addr 0000000000000000
 CPU: 0 PID: 0 Comm: swapper Not tainted 5.6.0-2-parisc64 #1 Debian 5.6.14-1
  IAOQ[0]: mem_init+0xb0/0x150
  IAOQ[1]: mem_init+0xb4/0x150
  RP(r2): start_kernel+0x6c8/0x1190
 Backtrace:
  [<0000000040101ab4>] start_kernel+0x6c8/0x1190
  [<0000000040108574>] start_parisc+0x158/0x1b8

on a HP-PARISC rp3440 machine with this memory layout:
 Memory Ranges:
  0) Start 0x0000000000000000 End 0x000000003fffffff Size   1024 MB
  1) Start 0x0000004040000000 End 0x00000040ffdfffff Size   3070 MB

Fix the crash by avoiding virt_to_page() and similar functions in
mem_init() until the memory zones have been fully set up.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoiommu: Fix reference count leak in iommu_group_alloc.
Qiushi Wu [Wed, 27 May 2020 21:00:19 +0000 (16:00 -0500)]
iommu: Fix reference count leak in iommu_group_alloc.

[ Upstream commit 7cc31613734c4870ae32f5265d576ef296621343 ]

kobject_init_and_add() takes reference even when it fails.
Thus, when kobject_init_and_add() returns an error,
kobject_put() must be called to properly clean up the kobject.

Fixes: d72e31c93746 ("iommu: IOMMU Groups")
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
Link: https://lore.kernel.org/r/20200527210020.6522-1-wu000273@umn.edu
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoinclude/asm-generic/topology.h: guard cpumask_of_node() macro argument
Arnd Bergmann [Thu, 28 May 2020 05:20:55 +0000 (22:20 -0700)]
include/asm-generic/topology.h: guard cpumask_of_node() macro argument

[ Upstream commit 4377748c7b5187c3342a60fa2ceb60c8a57a8488 ]

drivers/hwmon/amd_energy.c:195:15: error: invalid operands to binary expression ('void' and 'int')
                                        (channel - data->nr_cpus));
                                        ~~~~~~~~~^~~~~~~~~~~~~~~~~
include/asm-generic/topology.h:51:42: note: expanded from macro 'cpumask_of_node'
    #define cpumask_of_node(node)       ((void)node, cpu_online_mask)
                                               ^~~~
include/linux/cpumask.h:618:72: note: expanded from macro 'cpumask_first_and'
 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
                                                                       ^~~~~

Fixes: f0b848ce6fe9 ("cpumask: Introduce cpumask_of_{node,pcibus} to replace {node,pcibus}_to_cpumask")
Fixes: 8abee9566b7e ("hwmon: Add amd_energy driver to report energy counters")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Link: http://lkml.kernel.org/r/20200527134623.930247-1-arnd@arndb.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agofs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()
Alexander Potapenko [Thu, 28 May 2020 05:20:52 +0000 (22:20 -0700)]
fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()

[ Upstream commit 1d605416fb7175e1adf094251466caa52093b413 ]

KMSAN reported uninitialized data being written to disk when dumping
core.  As a result, several kilobytes of kmalloc memory may be written
to the core file and then read by a non-privileged user.

Reported-by: sam <sunhaoyl@outlook.com>
Signed-off-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200419100848.63472-1-glider@google.com
Link: https://github.com/google/kmsan/issues/76
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agomm: remove VM_BUG_ON(PageSlab()) from page_mapcount()
Konstantin Khlebnikov [Thu, 28 May 2020 05:20:47 +0000 (22:20 -0700)]
mm: remove VM_BUG_ON(PageSlab()) from page_mapcount()

[ Upstream commit 6988f31d558aa8c744464a7f6d91d34ada48ad12 ]

Replace superfluous VM_BUG_ON() with comment about correct usage.

Technically reverts commit 1d148e218a0d ("mm: add VM_BUG_ON_PAGE() to
page_mapcount()"), but context lines have changed.

Function isolate_migratepages_block() runs some checks out of lru_lock
when choose pages for migration.  After checking PageLRU() it checks
extra page references by comparing page_count() and page_mapcount().
Between these two checks page could be removed from lru, freed and taken
by slab.

As a result this race triggers VM_BUG_ON(PageSlab()) in page_mapcount().
Race window is tiny.  For certain workload this happens around once a
year.

    page:ffffea0105ca9380 count:1 mapcount:0 mapping:ffff88ff7712c180 index:0x0 compound_mapcount: 0
    flags: 0x500000000008100(slab|head)
    raw: 0500000000008100 dead000000000100 dead000000000200 ffff88ff7712c180
    raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
    page dumped because: VM_BUG_ON_PAGE(PageSlab(page))
    ------------[ cut here ]------------
    kernel BUG at ./include/linux/mm.h:628!
    invalid opcode: 0000 [#1] SMP NOPTI
    CPU: 77 PID: 504 Comm: kcompactd1 Tainted: G        W         4.19.109-27 #1
    Hardware name: Yandex T175-N41-Y3N/MY81-EX0-Y3N, BIOS R05 06/20/2019
    RIP: 0010:isolate_migratepages_block+0x986/0x9b0

The code in isolate_migratepages_block() was added in commit
119d6d59dcc0 ("mm, compaction: avoid isolating pinned pages") before
adding VM_BUG_ON into page_mapcount().

This race has been predicted in 2015 by Vlastimil Babka (see link
below).

[akpm@linux-foundation.org: comment tweaks, per Hugh]
Fixes: 1d148e218a0d ("mm: add VM_BUG_ON_PAGE() to page_mapcount()")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/159032779896.957378.7852761411265662220.stgit@buzz
Link: https://lore.kernel.org/lkml/557710E1.6060103@suse.cz/
Link: https://lore.kernel.org/linux-mm/158937872515.474360.5066096871639561424.stgit@buzz/T/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agolibceph: ignore pool overlay and cache logic on redirects
Jerry Lee [Mon, 18 May 2020 08:03:09 +0000 (16:03 +0800)]
libceph: ignore pool overlay and cache logic on redirects

[ Upstream commit 890bd0f8997ae6ac0a367dd5146154a3963306dd ]

OSD client should ignore cache/overlay flag if got redirect reply.
Otherwise, the client hangs when the cache tier is in forward mode.

[ idryomov: Redirects are effectively deprecated and no longer
  used or tested.  The original tiering modes based on redirects
  are inherently flawed because redirects can race and reorder,
  potentially resulting in data corruption.  The new proxy and
  readproxy tiering modes should be used instead of forward and
  readforward.  Still marking for stable as obviously correct,
  though. ]

Cc: stable@vger.kernel.org
URL: https://tracker.ceph.com/issues/23296
URL: https://tracker.ceph.com/issues/36406
Signed-off-by: Jerry Lee <leisurelysw24@gmail.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoexec: Always set cap_ambient in cap_bprm_set_creds
Eric W. Biederman [Mon, 25 May 2020 17:56:15 +0000 (12:56 -0500)]
exec: Always set cap_ambient in cap_bprm_set_creds

[ Upstream commit a4ae32c71fe90794127b32d26d7ad795813b502e ]

An invariant of cap_bprm_set_creds is that every field in the new cred
structure that cap_bprm_set_creds might set, needs to be set every
time to ensure the fields does not get a stale value.

The field cap_ambient is not set every time cap_bprm_set_creds is
called, which means that if there is a suid or sgid script with an
interpreter that has neither the suid nor the sgid bits set the
interpreter should be able to accept ambient credentials.
Unfortuantely because cap_ambient is not reset to it's original value
the interpreter can not accept ambient credentials.

Given that the ambient capability set is expected to be controlled by
the caller, I don't think this is particularly serious.  But it is
definitely worth fixing so the code works correctly.

I have tested to verify my reading of the code is correct and the
interpreter of a sgid can receive ambient capabilities with this
change and cannot receive ambient capabilities without this change.

Cc: stable@vger.kernel.org
Cc: Andy Lutomirski <luto@kernel.org>
Fixes: 58319057b784 ("capabilities: ambient capabilities")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoALSA: usb-audio: mixer: volume quirk for ESS Technology Asus USB DAC
Chris Chiu [Tue, 26 May 2020 06:26:13 +0000 (14:26 +0800)]
ALSA: usb-audio: mixer: volume quirk for ESS Technology Asus USB DAC

[ Upstream commit 4020d1ccbe55bdf67b31d718d2400506eaf4b43f ]

The Asus USB DAC is a USB type-C audio dongle for connecting to
the headset and headphone. The volume minimum value -23040 which
is 0xa600 in hexadecimal with the resolution value 1 indicates
this should be endianness issue caused by the firmware bug. Add
a volume quirk to fix the volume control problem.

Also fixes this warning:
  Warning! Unlikely big volume range (=23040), cval->res is probably wrong.
  [5] FU [Headset Capture Volume] ch = 1, val = -23040/0/1
  Warning! Unlikely big volume range (=23040), cval->res is probably wrong.
  [7] FU [Headset Playback Volume] ch = 1, val = -23040/0/1

Signed-off-by: Chris Chiu <chiu@endlessm.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200526062613.55401-1-chiu@endlessm.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoALSA: hwdep: fix a left shifting 1 by 31 UB bug
Changming Liu [Tue, 26 May 2020 00:39:21 +0000 (00:39 +0000)]
ALSA: hwdep: fix a left shifting 1 by 31 UB bug

[ Upstream commit fb8cd6481ffd126f35e9e146a0dcf0c4e8899f2e ]

The "info.index" variable can be 31 in "1 << info.index".
This might trigger an undefined behavior since 1 is signed.

Fix this by casting 1 to 1u just to be sure "1u << 31" is defined.

Signed-off-by: Changming Liu <liu.changm@northeastern.edu>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/BL0PR06MB4548170B842CB055C9AF695DE5B00@BL0PR06MB4548.namprd06.prod.outlook.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoARM: dts/imx6q-bx50v3: Set display interface clock parents
Robert Beckett [Thu, 14 May 2020 17:02:37 +0000 (19:02 +0200)]
ARM: dts/imx6q-bx50v3: Set display interface clock parents

[ Upstream commit 665e7c73a7724a393b4ec92d1ae1e029925ef2b7 ]

Avoid LDB and IPU DI clocks both using the same parent. LDB requires
pasthrough clock to avoid breaking timing while IPU DI does not.

Force IPU DI clocks to use IMX6QDL_CLK_PLL2_PFD0_352M as parent
and LDB to use IMX6QDL_CLK_PLL5_VIDEO_DIV.

This fixes an issue where attempting atomic modeset while using
HDMI and display port at the same time causes LDB clock programming
to destroy the programming of HDMI that was done during the same
modeset.

Cc: stable@vger.kernel.org
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
[Use IMX6QDL_CLK_PLL2_PFD0_352M instead of IMX6QDL_CLK_PLL2_PFD2_396M
 originally chosen by Robert Beckett to avoid affecting eMMC clock
 by DRM atomic updates]
Signed-off-by: Ian Ray <ian.ray@ge.com>
[Squash Robert's and Ian's commits for bisectability, update patch
 description and add stable tag]
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoARM: dts: imx6q-bx50v3: Add internal switch
Sebastian Reichel [Tue, 23 Jan 2018 15:03:47 +0000 (16:03 +0100)]
ARM: dts: imx6q-bx50v3: Add internal switch

[ Upstream commit e26dead442689a861358f33126210b0f8de615a9 ]

B850v3, B650v3 and B450v3 all have a GPIO bit banged MDIO bus to
communicate with a Marvell switch. On all devices the switch is
connected to a PCI based network card, which needs to be referenced
by DT, so this also adds the common PCI root node.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoARM: dts: imx: Correct B850v3 clock assignment
Martyn Welch [Fri, 30 Jun 2017 13:43:37 +0000 (15:43 +0200)]
ARM: dts: imx: Correct B850v3 clock assignment

[ Upstream commit 1d0c7bb20c083a6e810d2142545b5606f8131080 ]

The IPU that drives HDMI must have its pre_sel set to pll2_pfd_396m
to avoid stepping on the LVDS output's toes, as the PLL can't be clocked
to the pixel clock and to the LVDS serial clock (3.5*pixel clock) at the
same time.

As we are using ipu1_di0 and ipu2_di0, ensure both are switched to
to pll2_pfd2_396m to avoid issues. The LDB driver will switch the
required IPU to ldb_di1 when it uses it to drive LVDS.

Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Signed-off-by: Romain Perier <romain.perier@collabora.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoIB/qib: Call kobject_put() when kobject_init_and_add() fails
Kaike Wan [Tue, 12 May 2020 03:13:28 +0000 (23:13 -0400)]
IB/qib: Call kobject_put() when kobject_init_and_add() fails

[ Upstream commit a35cd6447effd5c239b564c80fa109d05ff3d114 ]

When kobject_init_and_add() returns an error in the function
qib_create_port_files(), the function kobject_put() is not called for the
corresponding kobject, which potentially leads to memory leak.

This patch fixes the issue by calling kobject_put() even if
kobject_init_and_add() fails. In addition, the ppd->diagc_kobj is released
along with other kobjects when the sysfs is unregistered.

Fixes: f931551bafe1 ("IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters")
Link: https://lore.kernel.org/r/20200512031328.189865.48627.stgit@awfm-01.aw.intel.com
Cc: <stable@vger.kernel.org>
Suggested-by: Lin Yi <teroincn@gmail.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoInput: synaptics-rmi4 - fix error return code in rmi_driver_probe()
Wei Yongjun [Tue, 28 Apr 2020 23:09:53 +0000 (16:09 -0700)]
Input: synaptics-rmi4 - fix error return code in rmi_driver_probe()

[ Upstream commit 5caab2da63207d6d631007f592f5219459e3454d ]

Fix to return a negative error code from the input_register_device()
error handling case instead of 0, as done elsewhere in this function.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20200428134948.78343-1-weiyongjun1@huawei.com
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoInput: i8042 - add ThinkPad S230u to i8042 reset list
Kevin Locke [Tue, 28 Apr 2020 01:07:20 +0000 (18:07 -0700)]
Input: i8042 - add ThinkPad S230u to i8042 reset list

[ Upstream commit 2712c91a54a1058d55c284152b4d93c979b67be6 ]

On the Lenovo ThinkPad Twist S230u (3347-4HU) with BIOS version
"GDETC1WW (1.81 ) 06/27/2019", the keyboard, Synaptics TouchPad, and
TrackPoint either do not function or stop functioning a few minutes
after boot.  This problem has been noted before, perhaps only occurring
with BIOS 1.57 and later.[1][2][3][4][5]

Odds of a BIOS fix appear to be low: 1.57 was released over 6 years ago
and although the [BIOS changelog] notes "Fixed an issue of UEFI
touchpad/trackpoint/keyboard/touchscreen" in 1.58, it appears to be
insufficient.

Setting i8042.reset=1 or adding 33474HU to the reset list avoids the
issue on my system from either warm or cold boot.

[1]: https://bugs.launchpad.net/bugs/1210748
[2]: https://bbs.archlinux.org/viewtopic.php?pid=1360425
[3]: https://forums.linuxmint.com/viewtopic.php?f=46&t=41200
[4]: https://forums.linuxmint.com/viewtopic.php?f=49&t=157115
[5]: https://forums.lenovo.com/topic/findpost/27/1337119
[BIOS changelog]: https://download.lenovo.com/pccbbs/mobiles/gduj33uc.txt

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/94f384b0f75f90f71425d7dce7ac82c59ddb87a8.1587702636.git.kevin@kevinlocke.name
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoInput: xpad - add custom init packet for Xbox One S controllers
Łukasz Patron [Wed, 22 Apr 2020 21:13:09 +0000 (14:13 -0700)]
Input: xpad - add custom init packet for Xbox One S controllers

[ Upstream commit 764f7f911bf72450c51eb74cbb262ad9933741d8 ]

Sending [ 0x05, 0x20, 0x00, 0x0f, 0x06 ] packet for Xbox One S controllers
fixes an issue where controller is stuck in Bluetooth mode and not sending
any inputs.

Signed-off-by: Łukasz Patron <priv.luk@gmail.com>
Reviewed-by: Cameron Gutman <aicommander@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200422075206.18229-1-priv.luk@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoInput: evdev - call input_flush_device() on release(), not flush()
Brendan Shanks [Wed, 22 Apr 2020 20:45:12 +0000 (13:45 -0700)]
Input: evdev - call input_flush_device() on release(), not flush()

[ Upstream commit 09264098ff153f60866039d60b31d39b66f55a31 ]

input_flush_device() should only be called once the struct file is being
released and no open descriptors remain, but evdev_flush() was calling
it whenever a file descriptor was closed.

This caused uploaded force-feedback effects to be erased when a process
did a dup()/close() on the event FD, called system(), etc.

Call input_flush_device() from evdev_release() instead.

Reported-by: Mathieu Maret <mathieu.maret@gmail.com>
Signed-off-by: Brendan Shanks <bshanks@codeweavers.com>
Link: https://lore.kernel.org/r/20200421231003.7935-1-bshanks@codeweavers.com
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoInput: usbtouchscreen - add support for BonXeon TP
James Hilliard [Sun, 19 Apr 2020 04:17:12 +0000 (21:17 -0700)]
Input: usbtouchscreen - add support for BonXeon TP

[ Upstream commit e3b4f94ef52ae1592cbe199bd38dbdc0d58b2217 ]

Based on available information this uses the singletouch irtouch
protocol. This is tested and confirmed to be fully functional on
the BonXeon TP hardware I have.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Link: https://lore.kernel.org/r/20200413184217.55700-1-james.hilliard1@gmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agocifs: Fix null pointer check in cifs_read
Steve French [Wed, 13 May 2020 15:27:16 +0000 (10:27 -0500)]
cifs: Fix null pointer check in cifs_read

[ Upstream commit 9bd21d4b1a767c3abebec203342f3820dcb84662 ]

Coverity scan noted a redundant null check

Coverity-id: 728517
Reported-by: Coverity <scan-admin@coverity.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Shyam Prasad N <nspmangalore@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agousb: gadget: legacy: fix redundant initialization warnings
Masahiro Yamada [Fri, 3 Apr 2020 13:16:51 +0000 (22:16 +0900)]
usb: gadget: legacy: fix redundant initialization warnings

[ Upstream commit d13cce757954fa663c69845611957396843ed87a ]

Fix the following cppcheck warnings:

drivers/usb/gadget/legacy/inode.c:1364:8: style: Redundant initialization for 'value'. The initialized value is overwritten$
 value = -EOPNOTSUPP;
       ^
drivers/usb/gadget/legacy/inode.c:1331:15: note: value is initialized
 int    value = -EOPNOTSUPP;
              ^
drivers/usb/gadget/legacy/inode.c:1364:8: note: value is overwritten
 value = -EOPNOTSUPP;
       ^
drivers/usb/gadget/legacy/inode.c:1817:8: style: Redundant initialization for 'value'. The initialized value is overwritten$
 value = -EINVAL;
       ^
drivers/usb/gadget/legacy/inode.c:1787:18: note: value is initialized
 ssize_t   value = len, length = len;
                 ^
drivers/usb/gadget/legacy/inode.c:1817:8: note: value is overwritten
 value = -EINVAL;
       ^
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agocachefiles: Fix race between read_waiter and read_copier involving op->to_do
Lei Xue [Thu, 7 May 2020 12:50:22 +0000 (08:50 -0400)]
cachefiles: Fix race between read_waiter and read_copier involving op->to_do

[ Upstream commit 7bb0c5338436dae953622470d52689265867f032 ]

There is a potential race in fscache operation enqueuing for reading and
copying multiple pages from cachefiles to netfs.  The problem can be seen
easily on a heavy loaded system (for example many processes reading files
continually on an NFS share covered by fscache triggered this problem within
a few minutes).

The race is due to cachefiles_read_waiter() adding the op to the monitor
to_do list and then then drop the object->work_lock spinlock before
completing fscache_enqueue_operation().  Once the lock is dropped,
cachefiles_read_copier() grabs the op, completes processing it, and
makes it through fscache_retrieval_complete() which sets the op->state to
the final state of FSCACHE_OP_ST_COMPLETE(4).  When cachefiles_read_waiter()
finally gets through the remainder of fscache_enqueue_operation()
it sees the invalid state, and hits the ASSERTCMP and the following
oops is seen:
[ 2259.612361] FS-Cache:
[ 2259.614785] FS-Cache: Assertion failed
[ 2259.618639] FS-Cache: 4 == 5 is false
[ 2259.622456] ------------[ cut here ]------------
[ 2259.627190] kernel BUG at fs/fscache/operation.c:70!
...
[ 2259.791675] RIP: 0010:[<ffffffffc061b4cf>]  [<ffffffffc061b4cf>] fscache_enqueue_operation+0xff/0x170 [fscache]
[ 2259.802059] RSP: 0000:ffffa0263d543be0  EFLAGS: 00010046
[ 2259.807521] RAX: 0000000000000019 RBX: ffffa01a4d390480 RCX: 0000000000000006
[ 2259.814847] RDX: 0000000000000000 RSI: 0000000000000046 RDI: ffffa0263d553890
[ 2259.822176] RBP: ffffa0263d543be8 R08: 0000000000000000 R09: ffffa0263c2d8708
[ 2259.829502] R10: 0000000000001e7f R11: 0000000000000000 R12: ffffa01a4d390480
[ 2259.844483] R13: ffff9fa9546c5920 R14: ffffa0263d543c80 R15: ffffa0293ff9bf10
[ 2259.859554] FS:  00007f4b6efbd700(0000) GS:ffffa0263d540000(0000) knlGS:0000000000000000
[ 2259.875571] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2259.889117] CR2: 00007f49e1624ff0 CR3: 0000012b38b38000 CR4: 00000000007607e0
[ 2259.904015] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2259.918764] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2259.933449] PKRU: 55555554
[ 2259.943654] Call Trace:
[ 2259.953592]  <IRQ>
[ 2259.955577]  [<ffffffffc03a7c12>] cachefiles_read_waiter+0x92/0xf0 [cachefiles]
[ 2259.978039]  [<ffffffffa34d3942>] __wake_up_common+0x82/0x120
[ 2259.991392]  [<ffffffffa34d3a63>] __wake_up_common_lock+0x83/0xc0
[ 2260.004930]  [<ffffffffa34d3510>] ? task_rq_unlock+0x20/0x20
[ 2260.017863]  [<ffffffffa34d3ab3>] __wake_up+0x13/0x20
[ 2260.030230]  [<ffffffffa34c72a0>] __wake_up_bit+0x50/0x70
[ 2260.042535]  [<ffffffffa35bdcdb>] unlock_page+0x2b/0x30
[ 2260.054495]  [<ffffffffa35bdd09>] page_endio+0x29/0x90
[ 2260.066184]  [<ffffffffa368fc81>] mpage_end_io+0x51/0x80

CPU1
cachefiles_read_waiter()
 20 static int cachefiles_read_waiter(wait_queue_entry_t *wait, unsigned mode,
 21                                   int sync, void *_key)
 22 {
...
 61         spin_lock(&object->work_lock);
 62         list_add_tail(&monitor->op_link, &op->to_do);
 63         spin_unlock(&object->work_lock);
<begin race window>
 64
 65         fscache_enqueue_retrieval(op);
182 static inline void fscache_enqueue_retrieval(struct fscache_retrieval *op)
183 {
184         fscache_enqueue_operation(&op->op);
185 }
 58 void fscache_enqueue_operation(struct fscache_operation *op)
 59 {
 60         struct fscache_cookie *cookie = op->object->cookie;
 61
 62         _enter("{OBJ%x OP%x,%u}",
 63                op->object->debug_id, op->debug_id, atomic_read(&op->usage));
 64
 65         ASSERT(list_empty(&op->pend_link));
 66         ASSERT(op->processor != NULL);
 67         ASSERT(fscache_object_is_available(op->object));
 68         ASSERTCMP(atomic_read(&op->usage), >, 0);
<end race window>

CPU2
cachefiles_read_copier()
168         while (!list_empty(&op->to_do)) {
...
202                 fscache_end_io(op, monitor->netfs_page, error);
203                 put_page(monitor->netfs_page);
204                 fscache_retrieval_complete(op, 1);

CPU1
 58 void fscache_enqueue_operation(struct fscache_operation *op)
 59 {
...
 69         ASSERTIFCMP(op->state != FSCACHE_OP_ST_IN_PROGRESS,
 70                     op->state, ==,  FSCACHE_OP_ST_CANCELLED);

Signed-off-by: Lei Xue <carmark.dlut@gmail.com>
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agogfs2: move privileged user check to gfs2_quota_lock_check
Bob Peterson [Tue, 5 May 2020 16:53:21 +0000 (11:53 -0500)]
gfs2: move privileged user check to gfs2_quota_lock_check

[ Upstream commit 4ed0c30811cb4d30ef89850b787a53a84d5d2bcb ]

Before this patch, function gfs2_quota_lock checked if it was called
from a privileged user, and if so, it bypassed the quota check:
superuser can operate outside the quotas.
That's the wrong place for the check because the lock/unlock functions
are separate from the lock_check function, and you can do lock and
unlock without actually checking the quotas.

This patch moves the check to gfs2_quota_lock_check.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agonet: microchip: encx24j600: add missed kthread_stop
Chuhong Yuan [Thu, 7 May 2020 15:13:20 +0000 (23:13 +0800)]
net: microchip: encx24j600: add missed kthread_stop

[ Upstream commit ff8ce319e9c25e920d994cc35236f0bb32dfc8f3 ]

This driver calls kthread_run() in probe, but forgets to call
kthread_stop() in probe failure and remove.
Add the missed kthread_stop() to fix it.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agogpio: tegra: mask GPIO IRQs during IRQ shutdown
Stephen Warren [Mon, 27 Apr 2020 23:26:05 +0000 (17:26 -0600)]
gpio: tegra: mask GPIO IRQs during IRQ shutdown

[ Upstream commit 0cf253eed5d2bdf7bb3152457b38f39b012955f7 ]

The driver currently leaves GPIO IRQs unmasked even when the GPIO IRQ
client has released the GPIO IRQ. This allows the HW to raise IRQs, and
SW to process them, after shutdown. Fix this by masking the IRQ when it's
shut down. This is usually taken care of by the irqchip core, but since
this driver has a custom irq_shutdown implementation, it must do this
explicitly itself.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Link: https://lore.kernel.org/r/20200427232605.11608-1-swarren@wwwdotorg.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoIB/cma: Fix reference count leak when no ipv4 addresses are set
Kalderon, Michal [Thu, 6 Jul 2017 20:22:11 +0000 (23:22 +0300)]
IB/cma: Fix reference count leak when no ipv4 addresses are set

commit 963916fdb3e5ad4af57ac959b5a03bf23f7568ca upstream.

Once in_dev_get is called to receive in_device pointer, the
in_device reference counter is increased, but if there are
no ipv4 addresses configured on the net-device the ifa_list
will be null, resulting in a flow that doesn't call in_dev_put
to decrease the ref_cnt.
This was exposed when running RoCE over ipv6 without any ipv4
addresses configured

Fixes: commit 8e3867310c90 ("IB/cma: Fix a race condition in iboe_addr_get_sgid()")

Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agouapi: fix linux/if_pppol2tp.h userspace compilation errors
Dmitry V. Levin [Wed, 15 Feb 2017 02:23:26 +0000 (05:23 +0300)]
uapi: fix linux/if_pppol2tp.h userspace compilation errors

commit a725eb15db80643a160310ed6bcfd6c5a6c907f2 upstream.

Because of <linux/libc-compat.h> interface limitations, <netinet/in.h>
provided by libc cannot be included after <linux/in.h>, therefore any
header that includes <netinet/in.h> cannot be included after <linux/in.h>.

Change uapi/linux/l2tp.h, the last uapi header that includes
<netinet/in.h>, to include <linux/in.h> and <linux/in6.h> instead of
<netinet/in.h> and use __SOCK_SIZE__ instead of sizeof(struct sockaddr)
the same way as uapi/linux/in.h does, to fix linux/if_pppol2tp.h userspace
compilation errors like this:

In file included from /usr/include/linux/l2tp.h:12:0,
                 from /usr/include/linux/if_pppol2tp.h:21,
/usr/include/netinet/in.h:31:8: error: redefinition of 'struct in_addr'

Fixes: 47c3e7783be4 ("net: l2tp: deprecate PPPOL2TP_MSG_* in favour of L2TP_MSG_*")
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Asbjoern Sloth Toennesen <asbjorn@asbjorn.st>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet/mlx4_core: fix a memory leak bug.
Qiushi Wu [Fri, 22 May 2020 19:07:15 +0000 (14:07 -0500)]
net/mlx4_core: fix a memory leak bug.

commit febfd9d3c7f74063e8e630b15413ca91b567f963 upstream.

In function mlx4_opreq_action(), pointer "mailbox" is not released,
when mlx4_cmd_box() return and error, causing a memory leak bug.
Fix this issue by going to "out" label, mlx4_free_cmd_mailbox() can
free this pointer.

Fixes: fe6f700d6cbb ("net/mlx4_core: Respond to operation request by firmware")
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet: sun: fix missing release regions in cas_init_one().
Qiushi Wu [Fri, 22 May 2020 21:50:27 +0000 (16:50 -0500)]
net: sun: fix missing release regions in cas_init_one().

commit 5a730153984dd13f82ffae93d7170d76eba204e9 upstream.

In cas_init_one(), "pdev" is requested by "pci_request_regions", but it
was not released after a call of the function “pci_write_config_byte”
failed. Thus replace the jump target “err_write_cacheline” by
"err_out_free_res".

Fixes: 1f26dac32057 ("[NET]: Add Sun Cassini driver.")
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet/mlx5: Add command entry handling completion
Moshe Shemesh [Fri, 27 Dec 2019 05:01:53 +0000 (07:01 +0200)]
net/mlx5: Add command entry handling completion

[ Upstream commit 17d00e839d3b592da9659c1977d45f85b77f986a ]

When FW response to commands is very slow and all command entries in
use are waiting for completion we can have a race where commands can get
timeout before they get out of the queue and handled. Timeout
completion on uninitialized command will cause releasing command's
buffers before accessing it for initialization and then we will get NULL
pointer exception while trying access it. It may also cause releasing
buffers of another command since we may have timeout completion before
even allocating entry index for this command.
Add entry handling completion to avoid this race.

Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet: qrtr: Fix passing invalid reference to qrtr_local_enqueue()
Manivannan Sadhasivam [Tue, 19 May 2020 18:14:16 +0000 (23:44 +0530)]
net: qrtr: Fix passing invalid reference to qrtr_local_enqueue()

[ Upstream commit d28ea1fbbf437054ef339afec241019f2c4e2bb6 ]

Once the traversal of the list is completed with list_for_each_entry(),
the iterator (node) will point to an invalid object. So passing this to
qrtr_local_enqueue() which is outside of the iterator block is erroneous
eventhough the object is not used.

So fix this by passing NULL to qrtr_local_enqueue().

Fixes: bdabad3e363d ("net: Add Qualcomm IPC router")
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet/mlx5e: Update netdev txq on completions during closure
Moshe Shemesh [Tue, 7 Apr 2020 14:38:28 +0000 (17:38 +0300)]
net/mlx5e: Update netdev txq on completions during closure

[ Upstream commit 5e911e2c06bd8c17df29147a5e2d4b17fafda024 ]

On sq closure when we free its descriptors, we should also update netdev
txq on completions which would not arrive. Otherwise if we reopen sqs
and attach them back, for example on fw fatal recovery flow, we may get
tx timeout.

Fixes: 29429f3300a3 ("net/mlx5e: Timeout if SQ doesn't flush during close")
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agosctp: Start shutdown on association restart if in SHUTDOWN-SENT state and socket...
Jere Leppänen [Wed, 20 May 2020 15:15:31 +0000 (18:15 +0300)]
sctp: Start shutdown on association restart if in SHUTDOWN-SENT state and socket is closed

[ Upstream commit d3e8e4c11870413789f029a71e72ae6e971fe678 ]

Commit bdf6fa52f01b ("sctp: handle association restarts when the
socket is closed.") starts shutdown when an association is restarted,
if in SHUTDOWN-PENDING state and the socket is closed. However, the
rationale stated in that commit applies also when in SHUTDOWN-SENT
state - we don't want to move an association to ESTABLISHED state when
the socket has been closed, because that results in an association
that is unreachable from user space.

The problem scenario:

1.  Client crashes and/or restarts.

2.  Server (using one-to-one socket) calls close(). SHUTDOWN is lost.

3.  Client reconnects using the same addresses and ports.

4.  Server's association is restarted. The association and the socket
    move to ESTABLISHED state, even though the server process has
    closed its descriptor.

Also, after step 4 when the server process exits, some resources are
leaked in an attempt to release the underlying inet sock structure in
ESTABLISHED state:

    IPv4: Attempt to release TCP socket in state 1 00000000377288c7

Fix by acting the same way as in SHUTDOWN-PENDING state. That is, if
an association is restarted in SHUTDOWN-SENT state and the socket is
closed, then start shutdown and don't move the association or the
socket to ESTABLISHED state.

Fixes: bdf6fa52f01b ("sctp: handle association restarts when the socket is closed.")
Signed-off-by: Jere Leppänen <jere.leppanen@nokia.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet sched: fix reporting the first-time use timestamp
Roman Mashak [Sun, 17 May 2020 12:46:31 +0000 (08:46 -0400)]
net sched: fix reporting the first-time use timestamp

[ Upstream commit b15e62631c5f19fea9895f7632dae9c1b27fe0cd ]

When a new action is installed, firstuse field of 'tcf_t' is explicitly set
to 0. Value of zero means "new action, not yet used"; as a packet hits the
action, 'firstuse' is stamped with the current jiffies value.

tcf_tm_dump() should return 0 for firstuse if action has not yet been hit.

Fixes: 48d8ee1694dd ("net sched actions: aggregate dumping of actions timeinfo")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet: revert "net: get rid of an signed integer overflow in ip_idents_reserve()"
Yuqi Jin [Sat, 16 May 2020 03:46:49 +0000 (11:46 +0800)]
net: revert "net: get rid of an signed integer overflow in ip_idents_reserve()"

[ Upstream commit a6211caa634da39d861a47437ffcda8b38ef421b ]

Commit adb03115f459 ("net: get rid of an signed integer overflow in ip_idents_reserve()")
used atomic_cmpxchg to replace "atomic_add_return" inside the function
"ip_idents_reserve". The reason was to avoid UBSAN warning.
However, this change has caused performance degrade and in GCC-8,
fno-strict-overflow is now mapped to -fwrapv -fwrapv-pointer
and signed integer overflow is now undefined by default at all
optimization levels[1]. Moreover, it was a bug in UBSAN vs -fwrapv
/-fno-strict-overflow, so Let's revert it safely.

[1] https://gcc.gnu.org/gcc-8/changes.html

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Suggested-by: Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jiong Wang <jiongwang@huawei.com>
Signed-off-by: Yuqi Jin <jinyuqi@huawei.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet: ipip: fix wrong address family in init error path
Vadim Fedorenko [Wed, 20 May 2020 08:50:48 +0000 (11:50 +0300)]
net: ipip: fix wrong address family in init error path

[ Upstream commit 57ebc8f08504f176eb0f25b3e0fde517dec61a4f ]

In case of error with MPLS support the code is misusing AF_INET
instead of AF_MPLS.

Fixes: 1b69e7e6c4da ("ipip: support MPLS over IPv4")
Signed-off-by: Vadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoax25: fix setsockopt(SO_BINDTODEVICE)
Eric Dumazet [Wed, 20 May 2020 01:24:43 +0000 (18:24 -0700)]
ax25: fix setsockopt(SO_BINDTODEVICE)

[ Upstream commit 687775cec056b38a4c8f3291e0dd7a9145f7b667 ]

syzbot was able to trigger this trace [1], probably by using
a zero optlen.

While we are at it, cap optlen to IFNAMSIZ - 1 instead of IFNAMSIZ.

[1]
BUG: KMSAN: uninit-value in strnlen+0xf9/0x170 lib/string.c:569
CPU: 0 PID: 8807 Comm: syz-executor483 Not tainted 5.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 strnlen+0xf9/0x170 lib/string.c:569
 dev_name_hash net/core/dev.c:207 [inline]
 netdev_name_node_lookup net/core/dev.c:277 [inline]
 __dev_get_by_name+0x75/0x2b0 net/core/dev.c:778
 ax25_setsockopt+0xfa3/0x1170 net/ax25/af_ax25.c:654
 __compat_sys_setsockopt+0x4ed/0x910 net/compat.c:403
 __do_compat_sys_setsockopt net/compat.c:413 [inline]
 __se_compat_sys_setsockopt+0xdd/0x100 net/compat.c:410
 __ia32_compat_sys_setsockopt+0x62/0x80 net/compat.c:410
 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline]
 do_fast_syscall_32+0x3bf/0x6d0 arch/x86/entry/common.c:398
 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f57dd9
Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000ffae8c1c EFLAGS: 00000217 ORIG_RAX: 000000000000016e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000101
RDX: 0000000000000019 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Local variable ----devname@ax25_setsockopt created at:
 ax25_setsockopt+0xe6/0x1170 net/ax25/af_ax25.c:536
 ax25_setsockopt+0xe6/0x1170 net/ax25/af_ax25.c:536

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoLinux 4.9.225 v4.9.225
Greg Kroah-Hartman [Wed, 27 May 2020 14:42:03 +0000 (16:42 +0200)]
Linux 4.9.225

4 years agoiio: sca3000: Remove an erroneous 'get_device()'
Christophe JAILLET [Wed, 6 May 2020 03:52:06 +0000 (05:52 +0200)]
iio: sca3000: Remove an erroneous 'get_device()'

[ Upstream commit 928edefbc18cd8433f7df235c6e09a9306e7d580 ]

This looks really unusual to have a 'get_device()' hidden in a 'dev_err()'
call.
Remove it.

While at it add a missing \n at the end of the message.

Fixes: 574fb258d636 ("Staging: IIO: VTI sca3000 series accelerometer driver (spi)")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agorapidio: fix an error in get_user_pages_fast() error handling
John Hubbard [Sat, 23 May 2020 05:22:48 +0000 (22:22 -0700)]
rapidio: fix an error in get_user_pages_fast() error handling

commit ffca476a0a8d26de767cc41d62b8ca7f540ecfdd upstream.

In the case of get_user_pages_fast() returning fewer pages than
requested, rio_dma_transfer() does not quite do the right thing.  It
attempts to release all the pages that were requested, rather than just
the pages that were pinned.

Fix the error handling so that only the pages that were successfully
pinned are released.

Fixes: e8de370188d0 ("rapidio: add mport char device driver")
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200517235620.205225-2-jhubbard@nvidia.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agomei: release me_cl object reference
Alexander Usyskin [Tue, 12 May 2020 22:31:40 +0000 (01:31 +0300)]
mei: release me_cl object reference

commit fc9c03ce30f79b71807961bfcb42be191af79873 upstream.

Allow me_cl object to be freed by releasing the reference
that was acquired  by one of the search functions:
__mei_me_cl_by_uuid_id() or __mei_me_cl_by_uuid()

Cc: <stable@vger.kernel.org>
Reported-by: 亿一 <teroincn@gmail.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20200512223140.32186-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoiio: dac: vf610: Fix an error handling path in 'vf610_dac_probe()'
Christophe JAILLET [Sun, 26 Apr 2020 19:44:03 +0000 (21:44 +0200)]
iio: dac: vf610: Fix an error handling path in 'vf610_dac_probe()'

commit aad4742fbf0a560c25827adb58695a4497ffc204 upstream.

A call to 'vf610_dac_exit()' is missing in an error handling path.

Fixes: 1b983bf42fad ("iio: dac: vf610_dac: Add IIO DAC driver for Vybrid SoC")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agostaging: greybus: Fix uninitialized scalar variable
Oscar Carter [Sun, 10 May 2020 10:14:26 +0000 (12:14 +0200)]
staging: greybus: Fix uninitialized scalar variable

commit 34625c1931f8204c234c532b446b9f53c69f4b68 upstream.

In the "gb_tty_set_termios" function the "newline" variable is declared
but not initialized. So the "flow_control" member is not initialized and
the OR / AND operations with itself results in an undefined value in
this member.

The purpose of the code is to set the flow control type, so remove the
OR / AND self operator and set the value directly.

Addresses-Coverity-ID: 1374016 ("Uninitialized scalar variable")
Fixes: e55c25206d5c9 ("greybus: uart: Handle CRTSCTS flag in termios")
Signed-off-by: Oscar Carter <oscar.carter@gmx.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200510101426.23631-1-oscar.carter@gmx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agostaging: iio: ad2s1210: Fix SPI reading
Dragos Bogdan [Wed, 29 Apr 2020 07:21:29 +0000 (10:21 +0300)]
staging: iio: ad2s1210: Fix SPI reading

commit 5e4f99a6b788047b0b8a7496c2e0c8f372f6edf2 upstream.

If the serial interface is used, the 8-bit address should be latched using
the rising edge of the WR/FSYNC signal.

This basically means that a CS change is required between the first byte
sent, and the second one.
This change splits the single-transfer transfer of 2 bytes into 2 transfers
with a single byte, and CS change in-between.

Note fixes tag is not accurate, but reflects a point beyond which there
are too many refactors to make backporting straight forward.

Fixes: b19e9ad5e2cb ("staging:iio:resolver:ad2s1210 general driver cleanup.")
Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoRevert "gfs2: Don't demote a glock until its revokes are written"
Bob Peterson [Fri, 8 May 2020 20:01:25 +0000 (15:01 -0500)]
Revert "gfs2: Don't demote a glock until its revokes are written"

[ Upstream commit b14c94908b1b884276a6608dea3d0b1b510338b7 ]

This reverts commit df5db5f9ee112e76b5202fbc331f990a0fc316d6.

This patch fixes a regression: patch df5db5f9ee112 allowed function
run_queue() to bypass its call to do_xmote() if revokes were queued for
the glock. That's wrong because its call to do_xmote() is what is
responsible for calling the go_sync() glops functions to sync both
the ail list and any revokes queued for it. By bypassing the call,
gfs2 could get into a stand-off where the glock could not be demoted
until its revokes are written back, but the revokes would not be
written back because do_xmote() was never called.

It "sort of" works, however, because there are other mechanisms like
the log flush daemon (logd) that can sync the ail items and revokes,
if it deems it necessary. The problem is: without file system pressure,
it might never deem it necessary.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agocxgb4/cxgb4vf: Fix mac_hlist initialization and free
Arjun Vynipadath [Tue, 20 Nov 2018 06:41:39 +0000 (12:11 +0530)]
cxgb4/cxgb4vf: Fix mac_hlist initialization and free

[ Upstream commit b539ea60f5043b9acd7562f04fa2117f18776cbb ]

Null pointer dereference seen when cxgb4vf driver is unloaded
without bringing up any interfaces, moving mac_hlist initialization
to driver probe and free the mac_hlist in remove to fix the issue.

Fixes: 24357e06ba51 ("cxgb4vf: fix memleak in mac_hlist initialization")
Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agocxgb4: free mac_hlist properly
Arjun Vynipadath [Fri, 9 Nov 2018 09:20:25 +0000 (14:50 +0530)]
cxgb4: free mac_hlist properly

[ Upstream commit 2a8d84bf513823ba398f4b2dec41b8decf4041af ]

The locally maintained list for tracking hash mac table was
not freed during driver remove.

Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agolibnvdimm/btt: Remove unnecessary code in btt_freelist_init
Vishal Verma [Thu, 28 Feb 2019 00:06:26 +0000 (17:06 -0700)]
libnvdimm/btt: Remove unnecessary code in btt_freelist_init

[ Upstream commit 2f8c9011151337d0bc106693f272f9bddbccfab2 ]

We call btt_log_read() twice, once to get the 'old' log entry, and again
to get the 'new' entry. However, we have no use for the 'old' entry, so
remove it.

Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoplatform/x86: alienware-wmi: fix kfree on potentially uninitialized pointer
Colin Ian King [Sat, 30 Mar 2019 00:17:12 +0000 (00:17 +0000)]
platform/x86: alienware-wmi: fix kfree on potentially uninitialized pointer

commit 98e2630284ab741804bd0713e932e725466f2f84 upstream.

Currently the kfree of output.pointer can be potentially freeing
an uninitalized pointer in the case where out_data is NULL. Fix this
by reworking the case where out_data is not-null to perform the
ACPI status check and also the kfree of outpoint.pointer in one block
and hence ensuring the pointer is only freed when it has been used.

Also replace the if (ptr != NULL) idiom with just if (ptr).

Fixes: ff0e9f26288d ("platform/x86: alienware-wmi: Correct a memory leak")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoubsan: build ubsan.c more conservatively
Arnd Bergmann [Sat, 3 Aug 2019 04:48:58 +0000 (21:48 -0700)]
ubsan: build ubsan.c more conservatively

commit af700eaed0564d5d3963a7a51cb0843629d7fe3d upstream.

objtool points out several conditions that it does not like, depending
on the combination with other configuration options and compiler
variants:

stack protector:
  lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch()+0xbf: call to __stack_chk_fail() with UACCESS enabled
  lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch_v1()+0xbe: call to __stack_chk_fail() with UACCESS enabled

stackleak plugin:
  lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch()+0x4a: call to stackleak_track_stack() with UACCESS enabled
  lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch_v1()+0x4a: call to stackleak_track_stack() with UACCESS enabled

kasan:
  lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch()+0x25: call to memcpy() with UACCESS enabled
  lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch_v1()+0x25: call to memcpy() with UACCESS enabled

The stackleak and kasan options just need to be disabled for this file
as we do for other files already.  For the stack protector, we already
attempt to disable it, but this fails on clang because the check is
mixed with the gcc specific -fno-conserve-stack option.  According to
Andrey Ryabinin, that option is not even needed, dropping it here fixes
the stackprotector issue.

Link: http://lkml.kernel.org/r/20190722125139.1335385-1-arnd@arndb.de
Link: https://lore.kernel.org/lkml/20190617123109.667090-1-arnd@arndb.de/t/
Link: https://lore.kernel.org/lkml/20190722091050.2188664-1-arnd@arndb.de/t/
Fixes: d08965a27e84 ("x86/uaccess, ubsan: Fix UBSAN vs. SMAP")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agox86/uaccess, ubsan: Fix UBSAN vs. SMAP
Peter Zijlstra [Wed, 3 Apr 2019 07:40:16 +0000 (09:40 +0200)]
x86/uaccess, ubsan: Fix UBSAN vs. SMAP

commit d08965a27e84ca090b504844d50c24fc98587b11 upstream.

UBSAN can insert extra code in random locations; including AC=1
sections. Typically this code is not safe and needs wrapping.

So far, only __ubsan_handle_type_mismatch* have been observed in AC=1
sections and therefore only those are annotated.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
[stable backport: only take the lib/Makefile change to resolve gcc-10
 build issues]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: device MTU setup, tunnel socket needs a lock
R. Parameswaran [Thu, 13 Apr 2017 01:31:04 +0000 (18:31 -0700)]
l2tp: device MTU setup, tunnel socket needs a lock

commit 57240d007816486131bee88cd474c2a71f0fe224 upstream.

The MTU overhead calculation in L2TP device set-up
merged via commit b784e7ebfce8cfb16c6f95e14e8532d0768ab7ff
needs to be adjusted to lock the tunnel socket while
referencing the sub-data structures to derive the
socket's IP overhead.

Reported-by: Guillaume Nault <g.nault@alphalink.fr>
Tested-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: R. Parameswaran <rparames@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agodmaengine: tegra210-adma: Fix an error handling path in 'tegra_adma_probe()'
Christophe JAILLET [Sat, 16 May 2020 21:42:05 +0000 (23:42 +0200)]
dmaengine: tegra210-adma: Fix an error handling path in 'tegra_adma_probe()'

commit 3a5fd0dbd87853f8bd2ea275a5b3b41d6686e761 upstream.

Commit b53611fb1ce9 ("dmaengine: tegra210-adma: Fix crash during probe")
has moved some code in the probe function and reordered the error handling
path accordingly.
However, a goto has been missed.

Fix it and goto the right label if 'dma_async_device_register()' fails, so
that all resources are released.

Fixes: b53611fb1ce9 ("dmaengine: tegra210-adma: Fix crash during probe")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200516214205.276266-1-christophe.jaillet@wanadoo.fr
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoALSA: pcm: fix incorrect hw_base increase
Brent Lu [Mon, 18 May 2020 04:30:38 +0000 (12:30 +0800)]
ALSA: pcm: fix incorrect hw_base increase

commit e7513c5786f8b33f0c107b3759e433bc6cbb2efa upstream.

There is a corner case that ALSA keeps increasing the hw_ptr but DMA
already stop working/updating the position for a long time.

In following log we can see the position returned from DMA driver does
not move at all but the hw_ptr got increased at some point of time so
snd_pcm_avail() will return a large number which seems to be a buffer
underrun event from user space program point of view. The program
thinks there is space in the buffer and fill more data.

[  418.510086] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 4096 avail 12368
[  418.510149] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 6910 avail 9554
...
[  418.681052] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 15102 avail 1362
[  418.681130] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 16464 avail 0
[  418.726515] sound pcmC0D5p: pos 96 hw_ptr 16464 appl_ptr 16464 avail 16368

This is because the hw_base will be increased by runtime->buffer_size
frames unconditionally if the hw_ptr is not updated for over half of
buffer time. As the hw_base increases, so does the hw_ptr increased
by the same number.

The avail value returned from snd_pcm_avail() could exceed the limit
(buffer_size) easily becase the hw_ptr itself got increased by same
buffer_size samples when the corner case happens. In following log,
the buffer_size is 16368 samples but the avail is 21810 samples so
CRAS server complains about it.

[  418.851755] sound pcmC0D5p: pos 96 hw_ptr 16464 appl_ptr 27390 avail 5442
[  418.926491] sound pcmC0D5p: pos 96 hw_ptr 32832 appl_ptr 27390 avail 21810

cras_server[1907]: pcm_avail returned frames larger than buf_size:
sof-glkda7219max: :0,5: 21810 > 16368

By updating runtime->hw_ptr_jiffies each time the HWSYNC is called,
the hw_base will keep the same when buffer stall happens at long as
the interval between each HWSYNC call is shorter than half of buffer
time.

Following is a log captured by a patched kernel. The hw_base/hw_ptr
value is fixed in this corner case and user space program should be
aware of the buffer stall and handle it.

[  293.525543] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 4096 avail 12368
[  293.525606] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 6880 avail 9584
[  293.525975] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 10976 avail 5488
[  293.611178] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 15072 avail 1392
[  293.696429] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 16464 avail 0
...
[  381.139517] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 16464 avail 0

Signed-off-by: Brent Lu <brent.lu@intel.com>
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1589776238-23877-1-git-send-email-brent.lu@intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: initialise PPP sessions before registering them
Guillaume Nault [Thu, 21 May 2020 23:39:37 +0000 (00:39 +0100)]
l2tp: initialise PPP sessions before registering them

commit f98be6c6359e7e4a61aaefb9964c1db31cb9ec0c upstream.

pppol2tp_connect() initialises L2TP sessions after they've been exposed
to the rest of the system by l2tp_session_register(). This puts
sessions into transient states that are the source of several races, in
particular with session's deletion path.

This patch centralises the initialisation code into
pppol2tp_session_init(), which is called before the registration phase.
The only field that can't be set before session registration is the
pppol2tp socket pointer, which has already been converted to RCU. So
pppol2tp_connect() should now be race-free.

The session's .session_close() callback is now set before registration.
Therefore, it's always called when l2tp_core deletes the session, even
if it was created by pppol2tp_session_create() and hasn't been plugged
to a pppol2tp socket yet. That'd prevent session free because the extra
reference taken by pppol2tp_session_close() wouldn't be dropped by the
socket's ->sk_destruct() callback (pppol2tp_session_destruct()).
We could set .session_close() only while connecting a session to its
pppol2tp socket, or teach pppol2tp_session_close() to avoid grabbing a
reference when the session isn't connected, but that'd require adding
some form of synchronisation to be race free.

Instead of that, we can just let the pppol2tp socket hold a reference
on the session as soon as it starts depending on it (that is, in
pppol2tp_connect()). Then we don't need to utilise
pppol2tp_session_close() to hold a reference at the last moment to
prevent l2tp_core from dropping it.

When releasing the socket, pppol2tp_release() now deletes the session
using the standard l2tp_session_delete() function, instead of merely
removing it from hash tables. l2tp_session_delete() drops the reference
the sessions holds on itself, but also makes sure it doesn't remove a
session twice. So it can safely be called, even if l2tp_core already
tried, or is concurrently trying, to remove the session.
Finally, pppol2tp_session_destruct() drops the reference held by the
socket.

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: protect sock pointer of struct pppol2tp_session with RCU
Guillaume Nault [Thu, 21 May 2020 23:39:36 +0000 (00:39 +0100)]
l2tp: protect sock pointer of struct pppol2tp_session with RCU

commit ee40fb2e1eb5bc0ddd3f2f83c6e39a454ef5a741 upstream.

pppol2tp_session_create() registers sessions that can't have their
corresponding socket initialised. This socket has to be created by
userspace, then connected to the session by pppol2tp_connect().
Therefore, we need to protect the pppol2tp socket pointer of L2TP
sessions, so that it can safely be updated when userspace is connecting
or closing the socket. This will eventually allow pppol2tp_connect()
to avoid generating transient states while initialising its parts of the
session.

To this end, this patch protects the pppol2tp socket pointer using RCU.

The pppol2tp socket pointer is still set in pppol2tp_connect(), but
only once we know the function isn't going to fail. It's eventually
reset by pppol2tp_release(), which now has to wait for a grace period
to elapse before it can drop the last reference on the socket. This
ensures that pppol2tp_session_get_sock() can safely grab a reference
on the socket, even after ps->sk is reset to NULL but before this
operation actually gets visible from pppol2tp_session_get_sock().

The rest is standard RCU conversion: pppol2tp_recv(), which already
runs in atomic context, is simply enclosed by rcu_read_lock() and
rcu_read_unlock(), while other functions are converted to use
pppol2tp_session_get_sock() followed by sock_put().
pppol2tp_session_setsockopt() is a special case. It used to retrieve
the pppol2tp socket from the L2TP session, which itself was retrieved
from the pppol2tp socket. Therefore we can just avoid dereferencing
ps->sk and directly use the original socket pointer instead.

With all users of ps->sk now handling NULL and concurrent updates, the
L2TP ->ref() and ->deref() callbacks aren't needed anymore. Therefore,
rather than converting pppol2tp_session_sock_hold() and
pppol2tp_session_sock_put(), we can just drop them.

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: initialise l2tp_eth sessions before registering them
Guillaume Nault [Thu, 21 May 2020 23:39:35 +0000 (00:39 +0100)]
l2tp: initialise l2tp_eth sessions before registering them

commit ee28de6bbd78c2e18111a0aef43ea746f28d2073 upstream.

Sessions must be initialised before being made externally visible by
l2tp_session_register(). Otherwise the session may be concurrently
deleted before being initialised, which can confuse the deletion path
and eventually lead to kernel oops.

Therefore, we need to move l2tp_session_register() down in
l2tp_eth_create(), but also handle the intermediate step where only the
session or the netdevice has been registered.

We can't just call l2tp_session_register() in ->ndo_init() because
we'd have no way to properly undo this operation in ->ndo_uninit().
Instead, let's register the session and the netdevice in two different
steps and protect the session's device pointer with RCU.

And now that we allow the session's .dev field to be NULL, we don't
need to prevent the netdevice from being removed anymore. So we can
drop the dev_hold() and dev_put() calls in l2tp_eth_create() and
l2tp_eth_dev_uninit().

Backporting Notes

l2tp_eth.c: In l2tp_eth_create the "out" label was renamed to "err".
There was one extra occurrence of "goto out" to update.

Fixes: d9e31d17ceba ("l2tp: Add L2TP ethernet pseudowire support")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: don't register sessions in l2tp_session_create()
Guillaume Nault [Thu, 21 May 2020 23:39:34 +0000 (00:39 +0100)]
l2tp: don't register sessions in l2tp_session_create()

commit 3953ae7b218df4d1e544b98a393666f9ae58a78c upstream.

Sessions created by l2tp_session_create() aren't fully initialised:
some pseudo-wire specific operations need to be done before making the
session usable. Therefore the PPP and Ethernet pseudo-wires continue
working on the returned l2tp session while it's already been exposed to
the rest of the system.
This can lead to various issues. In particular, the session may enter
the deletion process before having been fully initialised, which will
confuse the session removal code.

This patch moves session registration out of l2tp_session_create(), so
that callers can control when the session is exposed to the rest of the
system. This is done by the new l2tp_session_register() function.

Only pppol2tp_session_create() can be easily converted to avoid
modifying its session after registration (the debug message is dropped
in order to avoid the need for holding a reference on the session).

For pppol2tp_connect() and l2tp_eth_create()), more work is needed.
That'll be done in followup patches. For now, let's just register the
session right after its creation, like it was done before. The only
difference is that we can easily take a reference on the session before
registering it, so, at least, we're sure it's not going to be freed
while we're working on it.

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: fix l2tp_eth module loading
Guillaume Nault [Thu, 21 May 2020 23:39:33 +0000 (00:39 +0100)]
l2tp: fix l2tp_eth module loading

commit 9f775ead5e570e7e19015b9e4e2f3dd6e71a5935 upstream.

The l2tp_eth module crashes if its netlink callbacks are run when the
pernet data aren't initialised.

We should normally register_pernet_device() before the genl callbacks.
However, the pernet data only maintain a list of l2tpeth interfaces,
and this list is never used. So let's just drop pernet handling
instead.

Fixes: d9e31d17ceba ("l2tp: Add L2TP ethernet pseudowire support")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: pass tunnel pointer to ->session_create()
Guillaume Nault [Thu, 21 May 2020 23:39:32 +0000 (00:39 +0100)]
l2tp: pass tunnel pointer to ->session_create()

commit f026bc29a8e093edfbb2a77700454b285c97e8ad upstream.

Using l2tp_tunnel_find() in pppol2tp_session_create() and
l2tp_eth_create() is racy, because no reference is held on the
returned session. These functions are only used to implement the
->session_create callback which is run by l2tp_nl_cmd_session_create().
Therefore searching for the parent tunnel isn't necessary because
l2tp_nl_cmd_session_create() already has a pointer to it and holds a
reference.

This patch modifies ->session_create()'s prototype to directly pass the
the parent tunnel as parameter, thus avoiding searching for it in
pppol2tp_session_create() and l2tp_eth_create().

Since we have to touch the ->session_create() call in
l2tp_nl_cmd_session_create(), let's also remove the useless conditional:
we know that ->session_create isn't NULL at this point because it's
already been checked earlier in this same function.

Finally, one might be tempted to think that the removed
l2tp_tunnel_find() calls were harmless because they would return the
same tunnel as the one held by l2tp_nl_cmd_session_create() anyway.
But that tunnel might be removed and a new one created with same tunnel
Id before the l2tp_tunnel_find() call. In this case l2tp_tunnel_find()
would return the new tunnel which wouldn't be protected by the
reference held by l2tp_nl_cmd_session_create().

Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Fixes: d9e31d17ceba ("l2tp: Add L2TP ethernet pseudowire support")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: prevent creation of sessions on terminated tunnels
Guillaume Nault [Thu, 21 May 2020 23:39:31 +0000 (00:39 +0100)]
l2tp: prevent creation of sessions on terminated tunnels

commit f3c66d4e144a0904ea9b95d23ed9f8eb38c11bfb upstream.

l2tp_tunnel_destruct() sets tunnel->sock to NULL, then removes the
tunnel from the pernet list and finally closes all its sessions.
Therefore, it's possible to add a session to a tunnel that is still
reachable, but for which tunnel->sock has already been reset. This can
make l2tp_session_create() dereference a NULL pointer when calling
sock_hold(tunnel->sock).

This patch adds the .acpt_newsess field to struct l2tp_tunnel, which is
used by l2tp_tunnel_closeall() to prevent addition of new sessions to
tunnels. Resetting tunnel->sock is done after l2tp_tunnel_closeall()
returned, so that l2tp_session_add_to_tunnel() can safely take a
reference on it when .acpt_newsess is true.

The .acpt_newsess field is modified in l2tp_tunnel_closeall(), rather
than in l2tp_tunnel_destruct(), so that it benefits all tunnel removal
mechanisms. E.g. on UDP tunnels, a session could be added to a tunnel
after l2tp_udp_encap_destroy() proceeded. This would prevent the tunnel
from being removed because of the references held by this new session
on the tunnel and its socket. Even though the session could be removed
manually later on, this defeats the purpose of
commit 9980d001cec8 ("l2tp: add udp encap socket destroy handler").

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: hold tunnel used while creating sessions with netlink
Guillaume Nault [Thu, 21 May 2020 23:39:30 +0000 (00:39 +0100)]
l2tp: hold tunnel used while creating sessions with netlink

commit e702c1204eb57788ef189c839c8c779368267d70 upstream.

Use l2tp_tunnel_get() to retrieve tunnel, so that it can't go away on
us. Otherwise l2tp_tunnel_destruct() might release the last reference
count concurrently, thus freeing the tunnel while we're using it.

Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: hold tunnel while handling genl TUNNEL_GET commands
Guillaume Nault [Thu, 21 May 2020 23:39:29 +0000 (00:39 +0100)]
l2tp: hold tunnel while handling genl TUNNEL_GET commands

commit 4e4b21da3acc68a7ea55f850cacc13706b7480e9 upstream.

Use l2tp_tunnel_get() instead of l2tp_tunnel_find() so that we get
a reference on the tunnel, preventing l2tp_tunnel_destruct() from
freeing it from under us.

Also move l2tp_tunnel_get() below nlmsg_new() so that we only take
the reference when needed.

Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: hold tunnel while handling genl tunnel updates
Guillaume Nault [Thu, 21 May 2020 23:39:28 +0000 (00:39 +0100)]
l2tp: hold tunnel while handling genl tunnel updates

commit 8c0e421525c9eb50d68e8f633f703ca31680b746 upstream.

We need to make sure the tunnel is not going to be destroyed by
l2tp_tunnel_destruct() concurrently.

Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: hold tunnel while processing genl delete command
Guillaume Nault [Thu, 21 May 2020 23:39:27 +0000 (00:39 +0100)]
l2tp: hold tunnel while processing genl delete command

commit bb0a32ce4389e17e47e198d2cddaf141561581ad upstream.

l2tp_nl_cmd_tunnel_delete() needs to take a reference on the tunnel, to
prevent it from being concurrently freed by l2tp_tunnel_destruct().

Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: hold tunnel while looking up sessions in l2tp_netlink
Guillaume Nault [Thu, 21 May 2020 23:39:26 +0000 (00:39 +0100)]
l2tp: hold tunnel while looking up sessions in l2tp_netlink

commit 54652eb12c1b72e9602d09cb2821d5760939190f upstream.

l2tp_tunnel_find() doesn't take a reference on the returned tunnel.
Therefore, it's unsafe to use it because the returned tunnel can go
away on us anytime.

Fix this by defining l2tp_tunnel_get(), which works like
l2tp_tunnel_find(), but takes a reference on the returned tunnel.
Caller then has to drop this reference using l2tp_tunnel_dec_refcount().

As l2tp_tunnel_dec_refcount() needs to be moved to l2tp_core.h, let's
simplify the patch and not move the L2TP_REFCNT_DEBUG part. This code
has been broken (not even compiling) in May 2012 by
commit a4ca44fa578c ("net: l2tp: Standardize logging styles")
and fixed more than two years later by
commit 29abe2fda54f ("l2tp: fix missing line continuation"). So it
doesn't appear to be used by anyone.

Same thing for l2tp_tunnel_free(); instead of moving it to l2tp_core.h,
let's just simplify things and call kfree_rcu() directly in
l2tp_tunnel_dec_refcount(). Extra assertions and debugging code
provided by l2tp_tunnel_free() didn't help catching any of the
reference counting and socket handling issues found while working on
this series.

Backporting Notes

l2tp_core.c: This patch deletes some code / moves some code to
l2tp_core.h and follows the patch (not including in this series) that
switched from atomic to refcount_t. Moved code changed back to atomic.

Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: initialise session's refcount before making it reachable
Guillaume Nault [Thu, 21 May 2020 23:39:25 +0000 (00:39 +0100)]
l2tp: initialise session's refcount before making it reachable

commit 9ee369a405c57613d7c83a3967780c3e30c52ecc upstream.

Sessions must be fully initialised before calling
l2tp_session_add_to_tunnel(). Otherwise, there's a short time frame
where partially initialised sessions can be accessed by external users.

Backporting Notes

l2tp_core.c: moving code that had been converted from atomic to
refcount_t by an earlier change (which isn't being included in this
patch series).

Fixes: dbdbc73b4478 ("l2tp: fix duplicate session creation")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: define parameters of l2tp_tunnel_find*() as "const"
Guillaume Nault [Thu, 21 May 2020 23:39:24 +0000 (00:39 +0100)]
l2tp: define parameters of l2tp_tunnel_find*() as "const"

commit 2f858b928bf5a8174911aaec76b8b72a9ca0533d upstream.

l2tp_tunnel_find() and l2tp_tunnel_find_nth() don't modify "net".

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: define parameters of l2tp_session_get*() as "const"
Guillaume Nault [Thu, 21 May 2020 23:39:23 +0000 (00:39 +0100)]
l2tp: define parameters of l2tp_session_get*() as "const"

commit 9aaef50c44f132e040dcd7686c8e78a3390037c5 upstream.

Make l2tp_pernet()'s parameter constant, so that l2tp_session_get*() can
declare their "net" variable as "const".
Also constify "ifname" in l2tp_session_get_by_ifname().

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: remove l2tp_session_find()
Guillaume Nault [Thu, 21 May 2020 23:39:22 +0000 (00:39 +0100)]
l2tp: remove l2tp_session_find()

commit 55a3ce3b9d98f752df9e2cfb1cba7e715522428a upstream.

This function isn't used anymore.

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agol2tp: remove useless duplicate session detection in l2tp_netlink
Guillaume Nault [Thu, 21 May 2020 23:39:21 +0000 (00:39 +0100)]
l2tp: remove useless duplicate session detection in l2tp_netlink

commit af87ae465abdc070de0dc35d6c6a9e7a8cd82987 upstream.

There's no point in checking for duplicate sessions at the beginning of
l2tp_nl_cmd_session_create(); the ->session_create() callbacks already
return -EEXIST when the session already exists.

Furthermore, even if l2tp_session_find() returns NULL, a new session
might be created right after the test. So relying on ->session_create()
to avoid duplicate session is the only sane behaviour.

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoL2TP:Adjust intf MTU, add underlay L3, L2 hdrs.
R. Parameswaran [Thu, 21 May 2020 23:39:20 +0000 (00:39 +0100)]
L2TP:Adjust intf MTU, add underlay L3, L2 hdrs.

commit b784e7ebfce8cfb16c6f95e14e8532d0768ab7ff upstream.

Existing L2TP kernel code does not derive the optimal MTU for Ethernet
pseudowires and instead leaves this to a userspace L2TP daemon or
operator. If an MTU is not specified, the existing kernel code chooses
an MTU that does not take account of all tunnel header overheads, which
can lead to unwanted IP fragmentation. When L2TP is used without a
control plane (userspace daemon), we would prefer that the kernel does a
better job of choosing a default pseudowire MTU, taking account of all
tunnel header overheads, including IP header options, if any. This patch
addresses this.

Change-set here uses the new kernel function, kernel_sock_ip_overhead(),
to factor the outer IP overhead on the L2TP tunnel socket (including
IP Options, if any) when calculating the default MTU for an Ethernet
pseudowire, along with consideration of the inner Ethernet header.

Signed-off-by: R. Parameswaran <rparames@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoNew kernel function to get IP overhead on a socket.
R. Parameswaran [Thu, 21 May 2020 23:39:19 +0000 (00:39 +0100)]
New kernel function to get IP overhead on a socket.

commit 113c3075931a334f899008f6c753abe70a3a9323 upstream.

A new function, kernel_sock_ip_overhead(), is provided
to calculate the cumulative overhead imposed by the IP
Header and IP options, if any, on a socket's payload.
The new function returns an overhead of zero for sockets
that do not belong to the IPv4 or IPv6 address families.
This is used in the L2TP code path to compute the
total outer IP overhead on the L2TP tunnel socket when
calculating the default MTU for Ethernet pseudowires.

Signed-off-by: R. Parameswaran <rparames@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet: l2tp: ppp: change PPPOL2TP_MSG_* => L2TP_MSG_*
Asbjørn Sloth Tønnesen [Thu, 21 May 2020 23:39:18 +0000 (00:39 +0100)]
net: l2tp: ppp: change PPPOL2TP_MSG_* => L2TP_MSG_*

commit fba40c632c6473fa89660e870a6042c0fe733f8c upstream.

Signed-off-by: Asbjoern Sloth Toennesen <asbjorn@asbjorn.st>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet: l2tp: deprecate PPPOL2TP_MSG_* in favour of L2TP_MSG_*
Asbjørn Sloth Tønnesen [Thu, 21 May 2020 23:39:17 +0000 (00:39 +0100)]
net: l2tp: deprecate PPPOL2TP_MSG_* in favour of L2TP_MSG_*

commit 47c3e7783be4e142b861d34b5c2e223330b05d8a upstream.

PPPOL2TP_MSG_* and L2TP_MSG_* are duplicates, and are being used
interchangeably in the kernel, so let's standardize on L2TP_MSG_*
internally, and keep PPPOL2TP_MSG_* defined in UAPI for compatibility.

Signed-off-by: Asbjoern Sloth Toennesen <asbjorn@asbjorn.st>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agonet: l2tp: export debug flags to UAPI
Asbjørn Sloth Tønnesen [Thu, 21 May 2020 23:39:16 +0000 (00:39 +0100)]
net: l2tp: export debug flags to UAPI

commit 41c43fbee68f4f9a2a9675d83bca91c77862d7f0 upstream.

Move the L2TP_MSG_* definitions to UAPI, as it is part of
the netlink API.

Signed-off-by: Asbjoern Sloth Toennesen <asbjorn@asbjorn.st>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agowatchdog: Fix the race between the release of watchdog_core_data and cdev
Kevin Hao [Tue, 8 Oct 2019 11:29:34 +0000 (19:29 +0800)]
watchdog: Fix the race between the release of watchdog_core_data and cdev

commit 72139dfa2464e43957d330266994740bb7be2535 upstream.

The struct cdev is embedded in the struct watchdog_core_data. In the
current code, we manage the watchdog_core_data with a kref, but the
cdev is manged by a kobject. There is no any relationship between
this kref and kobject. So it is possible that the watchdog_core_data is
freed before the cdev is entirely released. We can easily get the
following call trace with CONFIG_DEBUG_KOBJECT_RELEASE and
CONFIG_DEBUG_OBJECTS_TIMERS enabled.
  ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x38
  WARNING: CPU: 23 PID: 1028 at lib/debugobjects.c:481 debug_print_object+0xb0/0xf0
  Modules linked in: softdog(-) deflate ctr twofish_generic twofish_common camellia_generic serpent_generic blowfish_generic blowfish_common cast5_generic cast_common cmac xcbc af_key sch_fq_codel openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
  CPU: 23 PID: 1028 Comm: modprobe Not tainted 5.3.0-next-20190924-yoctodev-standard+ #180
  Hardware name: Marvell OcteonTX CN96XX board (DT)
  pstate: 00400009 (nzcv daif +PAN -UAO)
  pc : debug_print_object+0xb0/0xf0
  lr : debug_print_object+0xb0/0xf0
  sp : ffff80001cbcfc70
  x29: ffff80001cbcfc70 x28: ffff800010ea2128
  x27: ffff800010bad000 x26: 0000000000000000
  x25: ffff80001103c640 x24: ffff80001107b268
  x23: ffff800010bad9e8 x22: ffff800010ea2128
  x21: ffff000bc2c62af8 x20: ffff80001103c600
  x19: ffff800010e867d8 x18: 0000000000000060
  x17: 0000000000000000 x16: 0000000000000000
  x15: ffff000bd7240470 x14: 6e6968207473696c
  x13: 5f72656d6974203a x12: 6570797420746365
  x11: 6a626f2029302065 x10: 7461747320657669
  x9 : 7463612820657669 x8 : 3378302f3078302b
  x7 : 0000000000001d7a x6 : ffff800010fd5889
  x5 : 0000000000000000 x4 : 0000000000000000
  x3 : 0000000000000000 x2 : ffff000bff948548
  x1 : 276a1c9e1edc2300 x0 : 0000000000000000
  Call trace:
   debug_print_object+0xb0/0xf0
   debug_check_no_obj_freed+0x1e8/0x210
   kfree+0x1b8/0x368
   watchdog_cdev_unregister+0x88/0xc8
   watchdog_dev_unregister+0x38/0x48
   watchdog_unregister_device+0xa8/0x100
   softdog_exit+0x18/0xfec4 [softdog]
   __arm64_sys_delete_module+0x174/0x200
   el0_svc_handler+0xd0/0x1c8
   el0_svc+0x8/0xc

This is a common issue when using cdev embedded in a struct.
Fortunately, we already have a mechanism to solve this kind of issue.
Please see commit 233ed09d7fda ("chardev: add helper function to
register char devs with a struct device") for more detail.

In this patch, we choose to embed the struct device into the
watchdog_core_data, and use the API provided by the commit 233ed09d7fda
to make sure that the release of watchdog_core_data and cdev are
in sequence.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20191008112934.29669-1-haokexin@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
[bwh: Backported to 4.9:
 - There's no reboot notifier here
 - Adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoarm64: fix the flush_icache_range arguments in machine_kexec
Christoph Hellwig [Thu, 21 May 2020 14:44:34 +0000 (15:44 +0100)]
arm64: fix the flush_icache_range arguments in machine_kexec

Commit d51c214541c5154dda3037289ee895ea3ded5ebd upstream.

The second argument is the end "pointer", not the length.

Fixes: d28f6df1305a ("arm64/kexec: Add core kexec support")
Cc: <stable@vger.kernel.org> # 4.8.x-
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agopadata: purge get_cpu and reorder_via_wq from padata_do_serial
Daniel Jordan [Thu, 21 May 2020 20:48:47 +0000 (16:48 -0400)]
padata: purge get_cpu and reorder_via_wq from padata_do_serial

[ Upstream commit 065cf577135a4977931c7a1e1edf442bfd9773dd ]

With the removal of the padata timer, padata_do_serial no longer
needs special CPU handling, so remove it.

Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agopadata: initialize pd->cpu with effective cpumask
Daniel Jordan [Thu, 21 May 2020 20:48:46 +0000 (16:48 -0400)]
padata: initialize pd->cpu with effective cpumask

[ Upstream commit ec9c7d19336ee98ecba8de80128aa405c45feebb ]

Exercising CPU hotplug on a 5.2 kernel with recent padata fixes from
cryptodev-2.6.git in an 8-CPU kvm guest...

    # modprobe tcrypt alg="pcrypt(rfc4106(gcm(aes)))" type=3
    # echo 0 > /sys/devices/system/cpu/cpu1/online
    # echo c > /sys/kernel/pcrypt/pencrypt/parallel_cpumask
    # modprobe tcrypt mode=215

...caused the following crash:

    BUG: kernel NULL pointer dereference, address: 0000000000000000
    #PF: supervisor read access in kernel mode
    #PF: error_code(0x0000) - not-present page
    PGD 0 P4D 0
    Oops: 0000 [#1] SMP PTI
    CPU: 2 PID: 134 Comm: kworker/2:2 Not tainted 5.2.0-padata-base+ #7
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-<snip>
    Workqueue: pencrypt padata_parallel_worker
    RIP: 0010:padata_reorder+0xcb/0x180
    ...
    Call Trace:
     padata_do_serial+0x57/0x60
     pcrypt_aead_enc+0x3a/0x50 [pcrypt]
     padata_parallel_worker+0x9b/0xe0
     process_one_work+0x1b5/0x3f0
     worker_thread+0x4a/0x3c0
     ...

In padata_alloc_pd, pd->cpu is set using the user-supplied cpumask
instead of the effective cpumask, and in this case cpumask_first picked
an offline CPU.

The offline CPU's reorder->list.next is NULL in padata_reorder because
the list wasn't initialized in padata_init_pqueues, which only operates
on CPUs in the effective mask.

Fix by using the effective mask in padata_alloc_pd.

Fixes: 6fc4dbcf0276 ("padata: Replace delayed timer with immediate workqueue in padata_reorder")
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agopadata: Replace delayed timer with immediate workqueue in padata_reorder
Herbert Xu [Thu, 21 May 2020 20:48:45 +0000 (16:48 -0400)]
padata: Replace delayed timer with immediate workqueue in padata_reorder

[ Upstream commit 6fc4dbcf0276279d488c5fbbfabe94734134f4fa ]

The function padata_reorder will use a timer when it cannot progress
while completed jobs are outstanding (pd->reorder_objects > 0).  This
is suboptimal as if we do end up using the timer then it would have
introduced a gratuitous delay of one second.

In fact we can easily distinguish between whether completed jobs
are outstanding and whether we can make progress.  All we have to
do is look at the next pqueue list.

This patch does that by replacing pd->processed with pd->cpu so
that the next pqueue is more accessible.

A work queue is used instead of the original try_again to avoid
hogging the CPU.

Note that we don't bother removing the work queue in
padata_flush_queues because the whole premise is broken.  You
cannot flush async crypto requests so it makes no sense to even
try.  A subsequent patch will fix it by replacing it with a ref
counting scheme.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
[dj: - adjust context
     - corrected setup_timer -> timer_setup to delete hunk
     - skip padata_flush_queues() hunk, function already removed
       in 4.9]
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agopadata: set cpu_index of unused CPUs to -1
Mathias Krause [Thu, 21 May 2020 20:48:44 +0000 (16:48 -0400)]
padata: set cpu_index of unused CPUs to -1

[ Upstream commit 1bd845bcb41d5b7f83745e0cb99273eb376f2ec5 ]

The parallel queue per-cpu data structure gets initialized only for CPUs
in the 'pcpu' CPU mask set. This is not sufficient as the reorder timer
may run on a different CPU and might wrongly decide it's the target CPU
for the next reorder item as per-cpu memory gets memset(0) and we might
be waiting for the first CPU in cpumask.pcpu, i.e. cpu_index 0.

Make the '__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index'
compare in padata_get_next() fail in this case by initializing the
cpu_index member of all per-cpu parallel queues. Use -1 for unused ones.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoi2c: dev: Fix the race between the release of i2c_dev and cdev
Kevin Hao [Fri, 11 Oct 2019 15:00:14 +0000 (23:00 +0800)]
i2c: dev: Fix the race between the release of i2c_dev and cdev

[ Upstream commit 1413ef638abae4ab5621901cf4d8ef08a4a48ba6 ]

The struct cdev is embedded in the struct i2c_dev. In the current code,
we would free the i2c_dev struct directly in put_i2c_dev(), but the
cdev is manged by a kobject, and the release of it is not predictable.
So it is very possible that the i2c_dev is freed before the cdev is
entirely released. We can easily get the following call trace with
CONFIG_DEBUG_KOBJECT_RELEASE and CONFIG_DEBUG_OBJECTS_TIMERS enabled.
  ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x38
  WARNING: CPU: 19 PID: 1 at lib/debugobjects.c:325 debug_print_object+0xb0/0xf0
  Modules linked in:
  CPU: 19 PID: 1 Comm: swapper/0 Tainted: G        W         5.2.20-yocto-standard+ #120
  Hardware name: Marvell OcteonTX CN96XX board (DT)
  pstate: 80c00089 (Nzcv daIf +PAN +UAO)
  pc : debug_print_object+0xb0/0xf0
  lr : debug_print_object+0xb0/0xf0
  sp : ffff00001292f7d0
  x29: ffff00001292f7d0 x28: ffff800b82151788
  x27: 0000000000000001 x26: ffff800b892c0000
  x25: ffff0000124a2558 x24: 0000000000000000
  x23: ffff00001107a1d8 x22: ffff0000116b5088
  x21: ffff800bdc6afca8 x20: ffff000012471ae8
  x19: ffff00001168f2c8 x18: 0000000000000010
  x17: 00000000fd6f304b x16: 00000000ee79de43
  x15: ffff800bc0e80568 x14: 79616c6564203a74
  x13: 6e6968207473696c x12: 5f72656d6974203a
  x11: ffff0000113f0018 x10: 0000000000000000
  x9 : 000000000000001f x8 : 0000000000000000
  x7 : ffff0000101294cc x6 : 0000000000000000
  x5 : 0000000000000000 x4 : 0000000000000001
  x3 : 00000000ffffffff x2 : 0000000000000000
  x1 : 387fc15c8ec0f200 x0 : 0000000000000000
  Call trace:
   debug_print_object+0xb0/0xf0
   __debug_check_no_obj_freed+0x19c/0x228
   debug_check_no_obj_freed+0x1c/0x28
   kfree+0x250/0x440
   put_i2c_dev+0x68/0x78
   i2cdev_detach_adapter+0x60/0xc8
   i2cdev_notifier_call+0x3c/0x70
   notifier_call_chain+0x8c/0xe8
   blocking_notifier_call_chain+0x64/0x88
   device_del+0x74/0x380
   device_unregister+0x54/0x78
   i2c_del_adapter+0x278/0x2d0
   unittest_i2c_bus_remove+0x3c/0x80
   platform_drv_remove+0x30/0x50
   device_release_driver_internal+0xf4/0x1c0
   driver_detach+0x58/0xa0
   bus_remove_driver+0x84/0xd8
   driver_unregister+0x34/0x60
   platform_driver_unregister+0x20/0x30
   of_unittest_overlay+0x8d4/0xbe0
   of_unittest+0xae8/0xb3c
   do_one_initcall+0xac/0x450
   do_initcall_level+0x208/0x224
   kernel_init_freeable+0x2d8/0x36c
   kernel_init+0x18/0x108
   ret_from_fork+0x10/0x1c
  irq event stamp: 3934661
  hardirqs last  enabled at (3934661): [<ffff00001009fa04>] debug_exception_exit+0x4c/0x58
  hardirqs last disabled at (3934660): [<ffff00001009fb14>] debug_exception_enter+0xa4/0xe0
  softirqs last  enabled at (3934654): [<ffff000010081d94>] __do_softirq+0x46c/0x628
  softirqs last disabled at (3934649): [<ffff0000100b4a1c>] irq_exit+0x104/0x118

This is a common issue when using cdev embedded in a struct.
Fortunately, we already have a mechanism to solve this kind of issue.
Please see commit 233ed09d7fda ("chardev: add helper function to
register char devs with a struct device") for more detail.

In this patch, we choose to embed the struct device into the i2c_dev,
and use the API provided by the commit 233ed09d7fda to make sure that
the release of i2c_dev and cdev are in sequence.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoARM: futex: Address build warning
Thomas Gleixner [Tue, 14 Apr 2020 09:07:22 +0000 (11:07 +0200)]
ARM: futex: Address build warning

[ Upstream commit 8101b5a1531f3390b3a69fa7934c70a8fd6566ad ]

Stephen reported the following build warning on a ARM multi_v7_defconfig
build with GCC 9.2.1:

kernel/futex.c: In function 'do_futex':
kernel/futex.c:1676:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized]
 1676 |   return oldval == cmparg;
      |          ~~~~~~~^~~~~~~~~
kernel/futex.c:1652:6: note: 'oldval' was declared here
 1652 |  int oldval, ret;
      |      ^~~~~~

introduced by commit a08971e9488d ("futex: arch_futex_atomic_op_inuser()
calling conventions change").

While that change should not make any difference it confuses GCC which
fails to work out that oldval is not referenced when the return value is
not zero.

GCC fails to properly analyze arch_futex_atomic_op_inuser(). It's not the
early return, the issue is with the assembly macros. GCC fails to detect
that those either set 'ret' to 0 and set oldval or set 'ret' to -EFAULT
which makes oldval uninteresting. The store to the callsite supplied oldval
pointer is conditional on ret == 0.

The straight forward way to solve this is to make the store unconditional.

Aside of addressing the build warning this makes sense anyway because it
removes the conditional from the fastpath. In the error case the stored
value is uninteresting and the extra store does not matter at all.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/87pncao2ph.fsf@nanos.tec.linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoplatform/x86: asus-nb-wmi: Do not load on Asus T100TA and T200TA
Hans de Goede [Wed, 22 Apr 2020 22:05:59 +0000 (00:05 +0200)]
platform/x86: asus-nb-wmi: Do not load on Asus T100TA and T200TA

[ Upstream commit 3bd12da7f50b8bc191fcb3bab1f55c582234df59 ]

asus-nb-wmi does not add any extra functionality on these Asus
Transformer books. They have detachable keyboards, so the hotkeys are
send through a HID device (and handled by the hid-asus driver) and also
the rfkill functionality is not used on these devices.

Besides not adding any extra functionality, initializing the WMI interface
on these devices actually has a negative side-effect. For some reason
the \_SB.ATKD.INIT() function which asus_wmi_platform_init() calls drives
GPO2 (INT33FC:02) pin 8, which is connected to the front facing webcam LED,
high and there is no (WMI or other) interface to drive this low again
causing the LED to be permanently on, even during suspend.

This commit adds a blacklist of DMI system_ids on which not to load the
asus-nb-wmi and adds these Transformer books to this list. This fixes
the webcam LED being permanently on under Linux.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoUSB: core: Fix misleading driver bug report
Alan Stern [Fri, 1 May 2020 20:07:28 +0000 (16:07 -0400)]
USB: core: Fix misleading driver bug report

[ Upstream commit ac854131d9844f79e2fdcef67a7707227538d78a ]

The syzbot fuzzer found a race between URB submission to endpoint 0
and device reset.  Namely, during the reset we call usb_ep0_reinit()
because the characteristics of ep0 may have changed (if the reset
follows a firmware update, for example).  While usb_ep0_reinit() is
running there is a brief period during which the pointers stored in
udev->ep_in[0] and udev->ep_out[0] are set to NULL, and if an URB is
submitted to ep0 during that period, usb_urb_ep_type_check() will
report it as a driver bug.  In the absence of those pointers, the
routine thinks that the endpoint doesn't exist.  The log message looks
like this:

------------[ cut here ]------------
usb 2-1: BOGUS urb xfer, pipe 2 != type 2
WARNING: CPU: 0 PID: 9241 at drivers/usb/core/urb.c:478
usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478

Now, although submitting an URB while the device is being reset is a
questionable thing to do, it shouldn't count as a driver bug as severe
as submitting an URB for an endpoint that doesn't exist.  Indeed,
endpoint 0 always exists, even while the device is in its unconfigured
state.

To prevent these misleading driver bug reports, this patch updates
usb_disable_endpoint() to avoid clearing the ep_in[] and ep_out[]
pointers when the endpoint being disabled is ep0.  There's no danger
of leaving a stale pointer in place, because the usb_host_endpoint
structure being pointed to is stored permanently in udev->ep0; it
doesn't get deallocated until the entire usb_device structure does.

Reported-and-tested-by: syzbot+db339689b2101f6f6071@syzkaller.appspotmail.com
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/Pine.LNX.4.44L0.2005011558590.903-100000@netrider.rowland.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoceph: fix double unlock in handle_cap_export()
Wu Bo [Thu, 30 Apr 2020 06:12:49 +0000 (14:12 +0800)]
ceph: fix double unlock in handle_cap_export()

[ Upstream commit 4d8e28ff3106b093d98bfd2eceb9b430c70a8758 ]

If the ceph_mdsc_open_export_target_session() return fails, it will
do a "goto retry", but the session mutex has already been unlocked.
Re-lock the mutex in that case to ensure that we don't unlock it
twice.

Signed-off-by: Wu Bo <wubo40@huawei.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agogtp: set NLM_F_MULTI flag in gtp_genl_dump_pdp()
Yoshiyuki Kurauchi [Thu, 30 Apr 2020 05:01:36 +0000 (14:01 +0900)]
gtp: set NLM_F_MULTI flag in gtp_genl_dump_pdp()

[ Upstream commit 846c68f7f1ac82c797a2f1db3344a2966c0fe2e1 ]

In drivers/net/gtp.c, gtp_genl_dump_pdp() should set NLM_F_MULTI
flag since it returns multipart message.
This patch adds a new arg "flags" in gtp_genl_fill_info() so that
flags can be set by the callers.

Signed-off-by: Yoshiyuki Kurauchi <ahochauwaaaaa@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agocomponent: Silence bind error on -EPROBE_DEFER
James Hilliard [Sat, 11 Apr 2020 19:02:41 +0000 (13:02 -0600)]
component: Silence bind error on -EPROBE_DEFER

[ Upstream commit 7706b0a76a9697021e2bf395f3f065c18f51043d ]

If a component fails to bind due to -EPROBE_DEFER we should not log an
error as this is not a real failure.

Fixes messages like:
vc4-drm soc:gpu: failed to bind 3f902000.hdmi (ops vc4_hdmi_ops): -517
vc4-drm soc:gpu: master bind failed: -517

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Link: https://lore.kernel.org/r/20200411190241.89404-1-james.hilliard1@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoconfigfs: fix config_item refcnt leak in configfs_rmdir()
Xiyu Yang [Sat, 25 Apr 2020 12:52:26 +0000 (20:52 +0800)]
configfs: fix config_item refcnt leak in configfs_rmdir()

[ Upstream commit 8aebfffacfa379ba400da573a5bf9e49634e38cb ]

configfs_rmdir() invokes configfs_get_config_item(), which returns a
reference of the specified config_item object to "parent_item" with
increased refcnt.

When configfs_rmdir() returns, local variable "parent_item" becomes
invalid, so the refcount should be decreased to keep refcount balanced.

The reference counting issue happens in one exception handling path of
configfs_rmdir(). When down_write_killable() fails, the function forgets
to decrease the refcnt increased by configfs_get_config_item(), causing
a refcnt leak.

Fix this issue by calling config_item_put() when down_write_killable()
fails.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoHID: multitouch: add eGalaxTouch P80H84 support
Sebastian Reichel [Mon, 13 Apr 2020 16:02:37 +0000 (18:02 +0200)]
HID: multitouch: add eGalaxTouch P80H84 support

[ Upstream commit f9e82295eec141a0569649d400d249333d74aa91 ]

Add support for P80H84 touchscreen from eGalaxy:

  idVendor           0x0eef D-WAV Scientific Co., Ltd
  idProduct          0xc002
  iManufacturer           1 eGalax Inc.
  iProduct                2 eGalaxTouch P80H84 2019 vDIVA_1204_T01 k4.02.146

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agogcc-common.h: Update for GCC 10
Frédéric Pierret (fepitre) [Tue, 7 Apr 2020 11:32:59 +0000 (13:32 +0200)]
gcc-common.h: Update for GCC 10

[ Upstream commit c7527373fe28f97d8a196ab562db5589be0d34b9 ]

Remove "params.h" include, which has been dropped in GCC 10.

Remove is_a_helper() macro, which is now defined in gimple.h, as seen
when running './scripts/gcc-plugin.sh g++ g++ gcc':

In file included from <stdin>:1:
./gcc-plugins/gcc-common.h:852:13: error: redefinition of ‘static bool is_a_helper<T>::test(U*) [with U = const gimple; T = const ggoto*]’
  852 | inline bool is_a_helper<const ggoto *>::test(const_gimple gs)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ./gcc-plugins/gcc-common.h:125,
                 from <stdin>:1:
/usr/lib/gcc/x86_64-redhat-linux/10/plugin/include/gimple.h:1037:1: note: ‘static bool is_a_helper<T>::test(U*) [with U = const gimple; T = const ggoto*]’ previously declared here
 1037 | is_a_helper <const ggoto *>::test (const gimple *gs)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Add -Wno-format-diag to scripts/gcc-plugins/Makefile to avoid
meaningless warnings from error() formats used by plugins:

scripts/gcc-plugins/structleak_plugin.c: In function ‘int plugin_init(plugin_name_args*, plugin_gcc_version*)’:
scripts/gcc-plugins/structleak_plugin.c:253:12: warning: unquoted sequence of 2 consecutive punctuation characters ‘'-’ in format [-Wformat-diag]
  253 |   error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Frédéric Pierret (fepitre) <frederic.pierret@qubes-os.org>
Link: https://lore.kernel.org/r/20200407113259.270172-1-frederic.pierret@qubes-os.org
[kees: include -Wno-format-diag for plugin builds]
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoi2c: mux: demux-pinctrl: Fix an error handling path in 'i2c_demux_pinctrl_probe()'
Christophe JAILLET [Wed, 6 May 2020 19:21:00 +0000 (21:21 +0200)]
i2c: mux: demux-pinctrl: Fix an error handling path in 'i2c_demux_pinctrl_probe()'

[ Upstream commit e9d1a0a41d4486955e96552293c1fcf1fce61602 ]

A call to 'i2c_demux_deactivate_master()' is missing in the error handling
path, as already done in the remove function.

Fixes: 50a5ba876908 ("i2c: mux: demux-pinctrl: add driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agoiommu/amd: Fix over-read of ACPI UID from IVRS table
Alexander Monakov [Mon, 11 May 2020 10:23:52 +0000 (10:23 +0000)]
iommu/amd: Fix over-read of ACPI UID from IVRS table

[ Upstream commit e461b8c991b9202b007ea2059d953e264240b0c9 ]

IVRS parsing code always tries to read 255 bytes from memory when
retrieving ACPI device path, and makes an assumption that firmware
provides a zero-terminated string. Both of those are bugs: the entry
is likely to be shorter than 255 bytes, and zero-termination is not
guaranteed.

With Acer SF314-42 firmware these issues manifest visibly in dmesg:

AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR0\xf0\xa5, rdevid:160
AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR1\xf0\xa5, rdevid:160
AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR2\xf0\xa5, rdevid:160
AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR3>\x83e\x8d\x9a\xd1...

The first three lines show how the code over-reads adjacent table
entries into the UID, and in the last line it even reads garbage data
beyond the end of the IVRS table itself.

Since each entry has the length of the UID (uidl member of ivhd_entry
struct), use that for memcpy, and manually add a zero terminator.

Avoid zero-filling hid and uid arrays up front, and instead ensure
the uid array is always zero-terminated. No change needed for the hid
array, as it was already properly zero-terminated.

Fixes: 2a0cb4e2d423c ("iommu/amd: Add new map for storing IVHD dev entry type HID")

Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org
Link: https://lore.kernel.org/r/20200511102352.1831-1-amonakov@ispras.ru
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
4 years agofix multiplication overflow in copy_fdtable()
Al Viro [Tue, 19 May 2020 21:48:52 +0000 (17:48 -0400)]
fix multiplication overflow in copy_fdtable()

[ Upstream commit 4e89b7210403fa4a8acafe7c602b6212b7af6c3b ]

cpy and set really should be size_t; we won't get an overflow on that,
since sysctl_nr_open can't be set above ~(size_t)0 / sizeof(void *),
so nr that would've managed to overflow size_t on that multiplication
won't get anywhere near copy_fdtable() - we'll fail with EMFILE
before that.

Cc: stable@kernel.org # v2.6.25+
Fixes: 9cfe015aa424 (get rid of NR_OPEN and introduce a sysctl_nr_open)
Reported-by: Thiago Macieira <thiago.macieira@intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>