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add: SIZE_MAX check #13

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Merged
frapank merged 1 commit into from
Jul 17, 2026
Merged

add: SIZE_MAX check #13

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6 changes: 6 additions & 0 deletions dstr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -468,6 +468,9 @@ dstr dstrreserve(dstr s, size_t new_cap)
size_t old_hd_size = _dstr_size_by_type(old_type);
size_t new_hd_size = _dstr_size_by_type(new_type);

if (new_cap > SIZE_MAX - new_hd_size)
return NULL;

void* old_hd = (char*)s - old_hd_size;

if (old_type == new_type) {
Expand Down Expand Up @@ -698,6 +701,9 @@ static dstr _dstrnew_allocator(enum dstrhd_type t,
size_t s_len,
size_t alloc_size)
{
if (alloc_size > SIZE_MAX - _dstr_size_by_type(t))
return NULL;

switch (t) {
case DSTRHD_TYPE_8: {
struct dstrhd8* hd = DSTR_MALLOC(sizeof(*hd) + alloc_size);
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