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| author | Peter Zijlstra <peterz@infradead.org> | 2017-03-04 10:27:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-22 12:43:40 +0100 |
| commit | 1522181f4bc14a61c72981439fcbe9a87496f3cf (patch) | |
| tree | c0d2e7c25eac466f737a9ea10d3a12fe044e07a5 | |
| parent | 6244ffc5a1221e593a937c7ad3c03a9ce691a8df (diff) | |
| download | linux-stable-1522181f4bc14a61c72981439fcbe9a87496f3cf.tar.gz linux-stable-1522181f4bc14a61c72981439fcbe9a87496f3cf.tar.bz2 linux-stable-1522181f4bc14a61c72981439fcbe9a87496f3cf.zip | |
futex: Add missing error handling to FUTEX_REQUEUE_PI
commit 9bbb25afeb182502ca4f2c4f3f88af0681b34cae upstream.
Thomas spotted that fixup_pi_state_owner() can return errors and we
fail to unlock the rt_mutex in that case.
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Cc: juri.lelli@arm.com
Cc: bigeasy@linutronix.de
Cc: xlpang@redhat.com
Cc: rostedt@goodmis.org
Cc: mathieu.desnoyers@efficios.com
Cc: jdesfossez@efficios.com
Cc: dvhart@infradead.org
Cc: bristot@redhat.com
Link: http://lkml.kernel.org/r/20170304093558.867401760@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/futex.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index aa45c4e13880..4c6b6e697b73 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -2896,6 +2896,8 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, if (q.pi_state && (q.pi_state->owner != current)) { spin_lock(q.lock_ptr); ret = fixup_pi_state_owner(uaddr2, &q, current); + if (ret && rt_mutex_owner(&q.pi_state->pi_mutex) == current) + rt_mutex_unlock(&q.pi_state->pi_mutex); /* * Drop the reference to the pi state which * the requeue_pi() code acquired for us. |