map_id_up_base(unsigned extents, struct uid_gid_map *map, u32 id)
{
	unsigned idx;
	u32 first, last;

	/* Find the matching extent */
	for (idx = 0; idx < extents; idx++) {
		first = map->extent[idx].lower_first;
		last = first + map->extent[idx].count - 1;
		if (id >= first && id <= last)
			return &map->extent[idx];
	}
	return NULL;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.