Messages in this thread Patch in this message | | | Date | Fri, 13 Mar 2009 09:36:28 GMT | From | Ingo Molnar <> | Subject | [tip:core/futexes] futex: remove the pointer math from double_unlock_hb, fix |
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Commit-ID: 88f502fedba82eff252b6420e8b8328e4ae25c67 Gitweb: http://git.kernel.org/tip/88f502fedba82eff252b6420e8b8328e4ae25c67 Author: Ingo Molnar <mingo@elte.hu> AuthorDate: Fri, 13 Mar 2009 10:32:07 +0100 Commit: Ingo Molnar <mingo@elte.hu> CommitDate: Fri, 13 Mar 2009 10:32:07 +0100
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>
--- kernel/futex.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c index 2331b73..6b50a02 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); } /*
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