Re: [PATCH v3 04/12] lib/ext2fs: Implement NLS support

["Theodore Y. Ts'o" <tytso@mit.edu>]

On Mon, Nov 26, 2018 at 05:19:41PM -0500, Gabriel Krisman Bertazi wrote:
> +static int ascii_casefold(const struct nls_table *table,
> +			  const unsigned char *str, size_t len,
> +			  unsigned char *dest, size_t dlen)
> +{
> +	unsigned i;
> +
> +	for (i = 0; i < len; i++)
> +		dest[i] = charset_toupper(table, str[i]);
> +
> +	return len;
> +}
> +
> +static int ascii_normalize(const struct nls_table *table,
> +			   const unsigned char *str, size_t len,
> +			   unsigned char *dest, size_t dlen)
> +{
> +	memcpy(dest, str, len);
> +	return len;
> +}

Shouldn't these two functions at least check to make sure dlen >= len
and return an error if not?

It's not paranoia when there are people out there actually trying to
get you.  :-)

						- Ted