From: Darren Hart Date: Fri, 20 Jul 2012 18:53:29 +0000 (-0700) Subject: futex: Test for pi_mutex on fault in futex_wait_requeue_pi() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b6070a8d9853eda010a549fa9a09eb8d7269b929;p=linux-beck.git 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 Cc: Dave Jones Cc: Dan Carpenter Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/dc59890338fc413606f04e5c5b131530734dae3d.1342809673.git.dvhart@linux.intel.com Signed-off-by: Thomas Gleixner --- diff --git a/kernel/futex.c b/kernel/futex.c index e2b0fb9a0b3b..05018bfe21a7 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) { /*