diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d4a33e1..ac8664db 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4203,7 +4203,7 @@
 	return &memcg->css;
 fail:
 	mem_cgroup_free(memcg);
-	return NULL;
+	return ERR_PTR(-ENOMEM);
 }
 
 static int