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authorIngo Molnar <mingo@elte.hu>2009-03-13 10:32:07 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-13 10:32:07 +0100
commit88f502fedba82eff252b6420e8b8328e4ae25c67 (patch)
tree5063980d641f077da073ce972028c2b07ccb1bbc /kernel
parentf061d35150003b7fd5b133d14d66a74500fdaa60 (diff)
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futex: remove the pointer math from double_unlock_hb, fix
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/futex.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index 2331b73f693..6b50a024bca 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -659,7 +659,8 @@ static inline void
double_unlock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
{
spin_unlock(&hb1->lock);
- spin_unlock(&hb2->lock);
+ if (hb1 != hb2)
+ spin_unlock(&hb2->lock);
}
/*