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src/store/redis/hiredis/sds.c: Fix integer overflow (CVE-2021-21309). #711

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src/store/redis/hiredis/sds.c: Fix integer overflow (CVE-2021-21309). #711

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3 changes: 3 additions & 0 deletions src/store/redis/hiredis/sds.c
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,7 @@ sds sdsnewlen(const void *init, size_t initlen) {
int hdrlen = sdsHdrSize(type);
unsigned char *fp; /* flags pointer. */

assert(initlen + hdrlen + 1 > initlen); /* Catch size_t overflow */
sh = s_malloc(hdrlen+initlen+1);
if (sh == NULL) return NULL;
if (!init)
Expand Down Expand Up @@ -209,6 +210,7 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
len = sdslen(s);
sh = (char*)s-sdsHdrSize(oldtype);
newlen = (len+addlen);
assert(newlen > len); /* Catch size_t overflow */
if (newlen < SDS_MAX_PREALLOC)
newlen *= 2;
else
Expand All @@ -222,6 +224,7 @@ 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 */
if (oldtype==type) {
newsh = s_realloc(sh, hdrlen+newlen+1);
if (newsh == NULL) return NULL;
Expand Down