Technically realloc should handle this:
" However, unlike that *realloc*() call, *reallocarray*() fails safely in
the case where the multiplication would overflow. If such an over‐
flow occurs, *reallocarray*() returns NULL, sets *errno
<http://man7.org/linux/man-pages/man3/errno.3.html>* to *ENOMEM*, and
leaves the original block of memory unchanged."
On Sun, May 3, 2020 at 6:27 PM Commit Bot <[email protected]> wrote:
> From: Waldemar Kozaczuk <[email protected]>
> Committer: Waldemar Kozaczuk <[email protected]>
> Branch: master
>
> libc: add reallocarray
>
> Some apps like xclock from Fedora need reallocarray() which
> this patch adds as simple delegation to realloc.
>
> Signed-off-by: Waldemar Kozaczuk <[email protected]>
>
> ---
> diff --git a/core/mempool.cc b/core/mempool.cc
> --- a/core/mempool.cc
> +++ b/core/mempool.cc
> @@ -2014,6 +2014,11 @@ void* realloc(void* obj, size_t size)
> return buf;
> }
>
> +extern "C" void *reallocarray(void *ptr, size_t nmemb, size_t size)
> +{
> + return realloc(ptr, nmemb * size);
> +}
> +
> size_t malloc_usable_size(void* obj)
> {
> if ( obj == nullptr ) {
>
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