From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Fri, 25 Jul 2008 08:47:27 +0000 (-0700)
Subject: posix timers: release_posix_timer: kill the bogus put_task_struct(->it_process);
X-Git-Tag: v2.6.27-rc1~361
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96347e7759e2e433c427defa0fa1adfc8cce6226;p=pandora-kernel.git

posix timers: release_posix_timer: kill the bogus put_task_struct(->it_process);

release_posix_timer() can't be called with ->it_process != NULL.  Once
sys_timer_create() sets ->it_process it must not call
release_posix_timer(), otherwise we can race with another thread doing
sys_timer_delete(), this timer is visible to idr_find() and unlocked.

The same is true for two other callers (actually, for any possible
caller), sys_timer_delete() and itimer_delete().  They must clear
->it_process before unlock_timer() + release_posix_timer().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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