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Subject[PATCH] Pass nr_wake2 to futex_wake_op
Date
The fourth argument of sys_futex is ignored when op == FUTEX_WAKE_OP,
but futex_wake_op expects it as its nr_wake2 parameter.

The only user of this operation in glibc is always passing 1, so this
bug had no consequences so far.

Signed-off-by: Andreas Schwab <schwab@suse.de>

---
kernel/futex.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- linux-2.6.22.orig/kernel/futex.c 2007-07-02 00:40:44.000000000 +0200
+++ linux-2.6.22/kernel/futex.c 2007-07-07 15:56:42.000000000 +0200
@@ -2061,8 +2061,10 @@ asmlinkage long sys_futex(u32 __user *ua
}
/*
* requeue parameter in 'utime' if cmd == FUTEX_REQUEUE.
+ * number of waiters to wake in 'utime' if cmd == FUTEX_WAKE_OP.
*/
- if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE)
+ if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE ||
+ cmd == FUTEX_WAKE_OP)
val2 = (u32) (unsigned long) utime;

return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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