linux-kernel - [PATCH] Pass nr_wake2 to futex_wake

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Date:	Tue, 17 Jul 2007 13:31:29 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Ulrich Drepper <drepper@...hat.com>
Subject: [PATCH] Pass nr_wake2 to futex_wake_op

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@...e.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@...e.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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