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-rw-r--r--kernel/futex.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index 1dc98e4..cf0c8e2 100644
--- 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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