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futex: remove the pointer math from double_unlock_hb, fix

Browse source 
Impact: fix double unlock crash

Thomas Gleixner noticed that the simplified double_unlock_hb()
became ... too unsophisticated: in the hb1 == hb2 case it will
do a double unlock.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Darren Hart <dvhltc@us.ibm.com>
LKML-Reference: <20090312221118.11146.68610.stgit@Aeon>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-03-13 10:32:07 +01:00
parent f061d35150
commit 88f502fedb
1 changed files with 2 additions and 1 deletions
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3
kernel/futex.c
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@ -659,7 +659,8 @@ static inline void
double_unlock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2) double_unlock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
{ {
spin_unlock(&hb1->lock); spin_unlock(&hb1->lock);
spin_unlock(&hb2->lock); if (hb1 != hb2)
spin_unlock(&hb2->lock);
} }
/* /*