From 3c27db1cd9a452c52b9b4384dc887bca2d34f2e3 Mon Sep 17 00:00:00 2001
From: shenlongxing <shenlongxing2012@gmail.com>
Date: Thu, 28 Jun 2018 01:08:55 +0800
Subject: [PATCH] fix empty string for sentinel rename-command

---
 src/sentinel.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/sentinel.c b/src/sentinel.c
index 512b224e6..f7fcfe823 100644
--- a/src/sentinel.c
+++ b/src/sentinel.c
@@ -3482,6 +3482,11 @@ void sentinelSetCommand(client *c) {
             sds oldname = c->argv[++j]->ptr;
             sds newname = c->argv[++j]->ptr;
 
+            if ((sdslen(oldname) == 0) || (sdslen(newname) == 0)) {
+                badarg = sdslen(newname) ? j-1 : j;
+                goto badfmt;
+            }
+
             /* Remove any older renaming for this command. */
             dictDelete(ri->renamed_commands,oldname);