diff --git a/kernel/futex.c b/kernel/futex.c
index 1782803..06e8240d2 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -758,6 +758,13 @@
 	if (!pi_state)
 		return -EINVAL;
 
+	/*
+	 * If current does not own the pi_state then the futex is
+	 * inconsistent and user space fiddled with the futex value.
+	 */
+	if (pi_state->owner != current)
+		return -EINVAL;
+
 	raw_spin_lock(&pi_state->pi_mutex.wait_lock);
 	new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);