diff --git a/ipc/shm.c b/ipc/shm.c
index b0eb3757ab895d07970bec60b55f9bd895f7bd8a..4cd402e4cfeb603e2417a3796c3d9b22f3022f89 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -199,6 +199,7 @@ static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
 	}
 
 	ipc_unlock_object(ipcp);
+	ipcp = ERR_PTR(-EIDRM);
 err:
 	rcu_read_unlock();
 	/*