From bd6eb379d5282f7f4305c1dc9927eaf7265babf5 Mon Sep 17 00:00:00 2001
From: John Sully <jsully@snapchat.com>
Date: Fri, 14 Jul 2023 14:39:23 -0400
Subject: [PATCH] Prevent crash on free when using repl-disk-buffer-reserve
 (#207)

---
 src/replication.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/replication.cpp b/src/replication.cpp
index 280043ace..ee3583692 100644
--- a/src/replication.cpp
+++ b/src/replication.cpp
@@ -345,7 +345,8 @@ void freeReplicationBacklog(void) {
         client *c = (client*)listNodeValue(ln);
         serverAssert(c->flags & CLIENT_CLOSE_ASAP || FMasterHost(c));
     }
-    zfree(g_pserver->repl_backlog);
+    if (g_pserver->repl_backlog != g_pserver->repl_backlog_disk)
+        zfree(g_pserver->repl_backlog);
     g_pserver->repl_backlog = NULL;
 }