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| author | Darren Hart <dvhart@linux.intel.com> | 2012-07-20 11:53:29 -0700 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2014-02-10 16:11:36 -0500 |
| commit | b945852dc87c7a995f3f092b84fb824c984fcb6c (patch) | |
| tree | 42522b65ac5bc5b68b5d7b764f3879143768ff2e | |
| parent | 2d080ad431b7550b103c7fbac16c8d30dcf9f823 (diff) | |
| download | linux-stable-b945852dc87c7a995f3f092b84fb824c984fcb6c.tar.gz linux-stable-b945852dc87c7a995f3f092b84fb824c984fcb6c.zip | |
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: Paul Gortmaker <paul.gortmaker@windriver.com>
| -rw-r--r-- | kernel/futex.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index d4e7f0ea1f94..0e8043833223 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -2348,7 +2348,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared, * 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) { /* |