diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 74c96852459281cab2b959a0b2db55666c7c9a7b..60983f38852e4243ec2bba80dab1aa277a090711 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1319,6 +1319,7 @@ long keyctl_session_to_parent(void)
 already_same:
 	ret = 0;
 not_permitted:
+	write_unlock_irq(&tasklist_lock);
 	put_cred(cred);
 	return ret;