From 8526e04e7b5074944f95fafc9f19bd1b4d4a3a47 Mon Sep 17 00:00:00 2001
From: Huang Zhw <huang_zhw@126.com>
Date: Mon, 10 May 2021 23:29:11 +0800
Subject: [PATCH] cluster process publish message only for known nodes. (#8856)

---
 src/cluster.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/cluster.c b/src/cluster.c
index 54be70db2..129b06f17 100644
--- a/src/cluster.c
+++ b/src/cluster.c
@@ -2148,6 +2148,8 @@ int clusterProcessPacket(clusterLink *link) {
                 hdr->sender, hdr->data.fail.about.nodename);
         }
     } else if (type == CLUSTERMSG_TYPE_PUBLISH) {
+        if (!sender) return 1;  /* We don't know that node. */
+
         robj *channel, *message;
         uint32_t channel_len, message_len;