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[PATCH] add missing memory barriers to ipc/sem.c
Two smp_wmb() statements are missing in the sysv sem code: This could cause stack corruptions. The attached patch adds them. Signed-Off-By: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -381,6 +381,7 @@ static void update_queue (struct sem_array * sma)
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/* hands-off: q will disappear immediately after
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* writing q->status.
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*/
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smb_wmb();
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q->status = error;
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q = n;
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} else {
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@ -461,6 +462,7 @@ static void freeary (struct sem_array *sma, int id)
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n = q->next;
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q->status = IN_WAKEUP;
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wake_up_process(q->sleeper); /* doesn't sleep */
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smp_wmb();
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q->status = -EIDRM; /* hands-off q */
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q = n;
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}
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