linux-kernel - [PATCH 1/3] futex: Test for pi_mutex on fault in futex_wait_requeue

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Date:	Fri, 20 Jul 2012 11:46:29 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] futex: Test for pi_mutex on fault in futex_wait_requeue_pi

If fixup_pi_state_owner() faults, pi_mutex may be NULL. Test
for pi_mutex != NULL before testing the owner against current
and possibly unlocking it.

Signed-off-by: Darren Hart <dvhart@...ux.intel.com>
CC: Dave Jones <davej@...hat.com>
CC: Dan Carpenter <dan.carpenter@...cle.com>
CC: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/futex.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index e2b0fb9..05018bf 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2370,7 +2370,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
 	 * fault, unlock the rt_mutex and return the fault to userspace.
 	 */
 	if (ret == -EFAULT) {
-		if (rt_mutex_owner(pi_mutex) == current)
+		if (pi_mutex && rt_mutex_owner(pi_mutex) == current)
 			rt_mutex_unlock(pi_mutex);
 	} else if (ret == -EINTR) {
 		/*
-- 
1.7.10.4

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