nss: introduce signed integer overflow check in malloc

[Andreas Schwab]

On Jun 19 2026, Marcus Poller wrote:

> diff --git a/nss/getaddrinfo.c b/nss/getaddrinfo.c
> index 4f6ac3358a..78f5bababc 100644
> --- a/nss/getaddrinfo.c
> +++ b/nss/getaddrinfo.c
> @@ -234,7 +234,7 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, int family,
>        array = array->next;
>      }
>  
> -  array = realloc (res->at, (old + count) * sizeof (*array));
> +  array = reallocarray (res->at, (old + count), sizeof (*array));

The parens are now redundant.

-- 
Andreas Schwab, schwab@linux-m68k.org
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