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| author | Darren Hart <dvhart@linux.intel.com> | 2012-07-20 11:53:29 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-08-10 00:24:49 +0100 |
| commit | c2da76144f8b38d0a958ff1cd669d5b78e5c3018 (patch) | |
| tree | e18145f718fc688bb5e61033323f247dc35bd8f5 /kernel | |
| parent | 842b98aa6a3a5c5efb7212aec56985cc06674f12 (diff) | |
| download | lwn-c2da76144f8b38d0a958ff1cd669d5b78e5c3018.tar.gz lwn-c2da76144f8b38d0a958ff1cd669d5b78e5c3018.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: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'kernel')
| -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 866c9d5959dd..ed9692605b84 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) { /* |