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authorManfred Spraul <manfred@colorfullife.com>2011-07-25 17:11:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-25 20:57:07 -0700
commitd694ad62bf539dbb20a0899ac2a954555f9e4a83 (patch)
treefd3ddc3269b6ad40a448046e60560fec30fbb0c5 /fs/hugetlbfs
parent8405b044e5238afebd7248d927c1d261d2239767 (diff)
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ipc/sem.c: fix race with concurrent semtimedop() timeouts and IPC_RMID
If a semaphore array is removed and in parallel a sleeping task is woken up (signal or timeout, does not matter), then the woken up task does not wait until wake_up_sem_queue_do() is completed. This will cause crashes, because wake_up_sem_queue_do() will read from a stale pointer. The fix is simple: Regardless of anything, always call get_queue_result(). This function waits until wake_up_sem_queue_do() has finished it's task. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=27142 Reported-by: Yuriy Yevtukhov <yuriy@ucoz.com> Reported-by: Harald Laabs <kernel@dasr.de> Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: <stable@kernel.org> [2.6.35+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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