From dadc67a92e4dbd548701982921aa92e5612e3ce1 Mon Sep 17 00:00:00 2001
From: YiyuanGUO <yguoaz@gmail.com>
Date: Wed, 29 Sep 2021 10:20:35 +0300
Subject: [PATCH] Fix integer overflow in _sdsMakeRoomFor (CVE-2021-41099)

---
 src/sds.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/sds.c b/src/sds.c
index 8d1c2dbd0..65fb3c717 100644
--- a/src/sds.c
+++ b/src/sds.c
@@ -233,7 +233,7 @@ void sdsclear(sds s) {
 sds sdsMakeRoomFor(sds s, size_t addlen) {
     void *sh, *newsh;
     size_t avail = sdsavail(s);
-    size_t len, newlen;
+    size_t len, newlen, reqlen;
     char type, oldtype = s[-1] & SDS_TYPE_MASK;
     int hdrlen;
     size_t usable;
@@ -243,7 +243,7 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
 
     len = sdslen(s);
     sh = (char*)s-sdsHdrSize(oldtype);
-    newlen = (len+addlen);
+    reqlen = newlen = (len+addlen);
     assert(newlen > len);   /* Catch size_t overflow */
     if (newlen < SDS_MAX_PREALLOC)
         newlen *= 2;
@@ -258,7 +258,7 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
     if (type == SDS_TYPE_5) type = SDS_TYPE_8;
 
     hdrlen = sdsHdrSize(type);
-    assert(hdrlen + newlen + 1 > len);  /* Catch size_t overflow */
+    assert(hdrlen + newlen + 1 > reqlen);  /* Catch size_t overflow */
     if (oldtype==type) {
         newsh = s_realloc_usable(sh, hdrlen+newlen+1, &usable);
         if (newsh == NULL) return NULL;