local void new_pool(struct pool *pool, size_t size, int limit)
{
    pool->have = new_lock(0);
    pool->head = NULL;
    pool->size = size;
    pool->limit = limit;
    pool->made = 0;
}

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.