Calling futex_lock_pi is called with a reference to a non PI futex and
waiters exist already, lookup_pi_state() oopses due to pi_state == NULL.
Check this condition and return -EINVAL to userspace.
Signed-off-by: Thomas Gleixner <[email protected]>
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_h
* 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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