futex: Test for pi_mutex on fault in futex_wait_requeue_pi()
authorDarren Hart <dvhart@linux.intel.com>
Fri, 20 Jul 2012 18:53:29 +0000 (11:53 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 9 Aug 2012 15:31:53 +0000 (08:31 -0700)
commitd48c1ba2979634ecbbe344a8bd65035f32777f1b
tree93250aaa96091cfbb3449190b94bba614e223085
parentef2e080c19599e3d0844f3bc599ee5dd627fc850
futex: Test for pi_mutex on fault in futex_wait_requeue_pi()

commit b6070a8d9853eda010a549fa9a09eb8d7269b929 upstream.

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@linux.intel.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Link: http://lkml.kernel.org/r/dc59890338fc413606f04e5c5b131530734dae3d.1342809673.git.dvhart@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/futex.c