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[PATCH] per-task-delay-accounting: setup
[deliverable/linux.git]
/
kernel
/
futex.c
diff --git
a/kernel/futex.c
b/kernel/futex.c
index 1dc98e4dd287ec95872c7c771aab7f14e0d9ca42..cf0c8e21d1abaae85c17a816dbd42a8ed3132dd5 100644
(file)
--- a/
kernel/futex.c
+++ b/
kernel/futex.c
@@
-476,6
+476,12
@@
lookup_pi_state(u32 uval, struct futex_hash_bucket *hb, struct futex_q *me)
* the refcount and return its pi_state:
*/
pi_state = this->pi_state;
+ /*
+ * Userspace might have messed up non PI and PI futexes
+ */
+ if (unlikely(!pi_state))
+ return -EINVAL;
+
atomic_inc(&pi_state->refcount);
me->pi_state = pi_state;
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