cinfo->no_new_dev_lockres, DLM_LOCK_CR);
 
-	/* daemaon thread must exist */
 	thread = rcu_dereference_protected(mddev->thread, true);
+	if (!thread) {
+		pr_warn("md-cluster: Received metadata update but MD thread is not ready\n");
+		dlm_unlock_sync(cinfo->no_new_dev_lockres);
+		return;
+	}
+
 	wait_event(thread->wqueue,
 		   (got_lock = mddev_trylock(mddev)) ||
 		    test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state));
-- 
2.51.0[PATCH 6.19 075/844] md-cluster: fix NULL pointer dereference in process_metadata_updateSasha Levin <sashal@kernel.org> undefinedlinux-kernel@vger.kernel.org, stable@vger.kernel.org undefined undefined undefined undefinedš]†¥'