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ath: Fix NULL ptr dereference in ath_reg_apply_world_flags
author
Helmut Schaa
<helmut.schaa@googlemail.com>
Tue, 8 Nov 2011 13:01:13 +0000
(14:01 +0100)
committer
John W. Linville
<linville@tuxdriver.com>
Tue, 8 Nov 2011 20:02:45 +0000
(15:02 -0500)
This happens with devices using a regulatory domain 0x68 that are only
5Ghz capable because ath_reg_apply_active_scan_flags assumes that we
always have a 2,4Ghz band.
CPU 0 Unable to handle kernel paging request at virtual address
00000000
, epc ==
82cd838c
, ra ==
82cd8384
Oops[#1]:
Cpu 0
$ 0 :
00000000
00000061
00000003
00000024
$ 4 :
00000003
000016c1
82f900ac
00000024
$ 8 :
00000000
82cda304
0058bad8
00000005
$12 :
005908f8
001e8481
00000003
1dcd6500
$16 :
00000002
00000000
82c700c0
82c700c0
$20 :
82d415e4
82c70d64
82c70200
82c715bc
$24 :
00000000
11e1a300
$28 :
82ce2000
82ce3c70
82c715a8
82cd8384
Hi :
00000000
Lo :
0000001e
epc :
82cd838c
ath_reg_apply_world_flags+0x78/0x17c [ath]
Not tainted
ra :
82cd8384
ath_reg_apply_world_flags+0x70/0x17c [ath]
Status:
1000d403
KERNEL EXL IE
Cause :
80800008
BadVA :
00000000
PrId :
00019374
(MIPS 24Kc)
Modules linked in: ath9k(+) ath9k_common ath9k_hw ath mac80211 cfg80211
compat_firmware_class compat arc4 aes_generic deflate ecb cbc
leds_gpio button_hotplug gpio_buttons input_polldev ie
Process insmod (pid: 464, threadinfo=
82ce2000
, task=
838b31d8
, tls=
00000000
)
Stack :
00000000
00000002
82f900ac
82c700c0
82d415e4
82c70d64
00000000
00000068
82f900ac
82cd88f4
82c700c0
82cda304
00000001
000020f0
82f90000
82c70d40
00000002
82f90000
82f900ac
82d4207c
82d518a0
00000002
7fee6118
8017c0d8
00000008
8397ba00
82c70d40
00000000
82c70200
83813000
83813058
b0010000
82d518a0
00000002
7fee6118
82d4b8c8
83445cc0
80120dc0
83804000
800eeda0
...
Call Trace:
[<
82cd838c
>] ath_reg_apply_world_flags+0x78/0x17c [ath]
[<
82cd88f4
>] ath_regd_init+0x464/0x488 [ath]
[<
82d4207c
>] ath9k_init_device+0x6a4/0x6b4 [ath9k]
[<
82d4b8c8
>] ath_pci_probe+0x27c/0x358 [ath9k]
[<
80181de0
>] pci_device_probe+0x64/0xa4
[<
8019e874
>] driver_probe_device+0xb8/0x190
[<
8019e9b8
>] __driver_attach+0x6c/0xa4
[<
8019dfc0
>] bus_for_each_dev+0x60/0xb0
[<
8019d744
>] bus_add_driver+0xc4/0x25c
[<
8019ed6c
>] driver_register+0xe0/0x198
[<
8018206c
>] __pci_register_driver+0x50/0xe0
[<
82dd0010
>] ath9k_init+0x10/0x54 [ath9k]
[<
8006b4a0
>] do_one_initcall+0x68/0x1ec
[<
800a901c
>] sys_init_module+0xec/0x23c
[<
80062544
>] stack_done+0x20/0x3c
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
drivers/net/wireless/ath/regd.c
patch
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blob
|
history
diff --git
a/drivers/net/wireless/ath/regd.c
b/drivers/net/wireless/ath/regd.c
index
028310f
..
f1be57f
100644
(file)
--- a/
drivers/net/wireless/ath/regd.c
+++ b/
drivers/net/wireless/ath/regd.c
@@
-253,6
+253,8
@@
ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
int r;
sband = wiphy->bands[IEEE80211_BAND_2GHZ];
+ if (!sband)
+ return;
/*
* If no country IE has been received always enable active scan