Save External image as Featured with WPUF plugin

// Save External image as Featured with WPUF plugin
add_action('wpuf_add_post_after_insert', 'featured_img_wpuf');
function featured_img_wpuf($post_id) {

    //$enlace_link = get_post_meta( $post_id, 'url_link', true );
    $thumb_url = 'http://img.vidaextra.com/2012/11/031112_imagen-disney_01.jpg';

        require_once(ABSPATH . 'wp-admin/includes/file.php');
        require_once(ABSPATH . 'wp-admin/includes/media.php');
        set_time_limit(300);

        if ( ! empty($thumb_url) ) {
            // Download file to temp location
            $tmp = download_url( $thumb_url );

            // Set variables for storage
            // fix file filename for query strings
            preg_match('/[^\?]+\.(jpg|JPG|jpe|JPE|jpeg|JPEG|gif|GIF|png|PNG)/', $thumb_url, $matches);
            $file_array['name'] = basename($matches[0]);
            $file_array['tmp_name'] = $tmp;

            // If error storing temporarily, unlink
            if ( is_wp_error( $tmp ) ) {
                @unlink($file_array['tmp_name']);
                $file_array['tmp_name'] = '';
            }

            // do the validation and storage stuff
            $thumbid = media_handle_sideload( $file_array, $post_id, $desc );
            // If error storing permanently, unlink
            if ( is_wp_error($thumbid) ) {
                @unlink($file_array['tmp_name']);
                return $thumbid;
            }
        }

        set_post_thumbnail( $post_id, $thumbid );