commit: b6070a8d9853eda010a549fa9a09eb8d7269b929 From: Darren Hart <[email protected]> Date: Fri, 20 Jul 2012 11:53:29 -0700 Subject: 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 <[email protected]> Cc: Dave Jones <[email protected]> Cc: Dan Carpenter <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/dc59890338fc413606f04e5c5b131530734dae3d.1342809673.git.dvh...@linux.intel.com Signed-off-by: Thomas Gleixner <[email protected]> --- kernel/futex.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) 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) { /* -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
