From 1df8d1146afec25f0923bf4d05ffe8c9f6b319ee Mon Sep 17 00:00:00 2001
From: yezhiwei <yezhiwei@cmss.chinamobile.com>
Date: Wed, 18 May 2022 11:38:09 +0800
Subject: [PATCH] fix global-buffer-overflow of fix_paths

---
 sql/mysqld.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 61b328541a90..52b492a3c603 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -8327,7 +8327,7 @@ static int fix_paths(void)
   my_realpath(mysql_home,mysql_home,MYF(0));
   /* Ensure that mysql_home ends in FN_LIBCHAR */
   pos=strend(mysql_home);
-  if (pos[-1] != FN_LIBCHAR)
+  if (mysql_home == pos || pos[-1] != FN_LIBCHAR)
   {
     pos[0]= FN_LIBCHAR;
     pos[1]= 0;