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

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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>
This commit is contained in:
Oleg Nesterov 2008-07-25 01:47:27 -07:00 committed by Linus Torvalds
parent 4b7a130426
commit 96347e7759
1 changed files with 0 additions and 3 deletions
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3
kernel/posix-timers.c
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@ -449,9 +449,6 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
spin_unlock_irqrestore(&idr_lock, flags);
}
sigqueue_free(tmr->sigq);
if (unlikely(tmr->it_process) &&
tmr->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
put_task_struct(tmr->it_process);
kmem_cache_free(posix_timers_cache, tmr);
}