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Fix potential integer overflow in sdsMakeRoomFor #186

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Fix potential integer overflow in sdsMakeRoomFor #186

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7 changes: 6 additions & 1 deletion sds.c
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Original file line number Diff line number Diff line change
Expand Up @@ -227,7 +227,12 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
if (type == SDS_TYPE_5) type = SDS_TYPE_8;

hdrlen = sdsHdrSize(type);
assert(hdrlen + newlen + 1 > reqlen); /* Catch size_t overflow */

if (hdrlen + newlen + 1 < reqlen)
{
return NULL;
}

if (oldtype==type) {
newsh = s_realloc(sh, hdrlen+newlen+1);
if (newsh == NULL) return NULL;
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