sched: Use dl_bw_of() under RCU read lock
authorKirill Tkhai <ktkhai@parallels.com>
Mon, 22 Sep 2014 18:36:24 +0000 (22:36 +0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 14 Nov 2014 16:59:49 +0000 (08:59 -0800)
commit119947ac0a0929f3602d6015c49116ea67cbc617
tree269596c6709d7af0abdf0ee0978c38ab5c96c3af
parentbb6e183ba2117dadf41da99470aa9ea056c38782
sched: Use dl_bw_of() under RCU read lock

commit 66339c31bc3978d5fff9c4b4cb590a861def4db2 upstream.

dl_bw_of() dereferences rq->rd which has to have RCU read lock held.
Probability of use-after-free isn't zero here.

Also add lockdep assert into dl_bw_cpus().

Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140922183624.11015.71558.stgit@localhost
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/sched/core.c