Ticket #50233: 50233.2.patch

src/wp-includes/canonical.php

@@ -27 +27 @@
  * or query in an attempt to figure the correct page to go to.
  *
  * @since 2.3.0
+ * @since 5.6.0 checks comment page count to limit pagination.
  *
  * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  * @global bool       $is_IIS
@@ -490 +491 @@
                                 && ( 'newest' === $default_comments_page && $cpage > 0
                                         || 'newest' !== $default_comments_page && $cpage > 1 )
                         ) {
-                                $addl_path  = ( ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '' );
-                                $addl_path .= user_trailingslashit( $wp_rewrite->comments_pagination_base . '-' . $cpage, 'commentpaged' );
+                                // checks comment page count to limit pagination.
+                                $per_page             = get_option( 'comments_per_page' );
+                                // get the total number of pages for comments.
+                                $comments_total_pages = ceil( ( $wp_query->post->comment_count ) / $per_page );
+                                if ( $cpage <= $comments_total_pages ) {
+                                        $addl_path  = ( ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '' );
+                                        $addl_path .= user_trailingslashit( $wp_rewrite->comments_pagination_base . '-' . $cpage, 'commentpaged' );
+                                }
 
                                 $redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] );
                         }

tests/phpunit/tests/link/wpGetCanonicalURL.php

@@ -152 +152 @@
         }
 
         /**
+         *  Limit pagination for comments.
+         *
+         *  @ticket 50233
+         */
+        public function test_comments_limit_paged_with_plain_permalink_structure() {
+                $cpage = 5;
+
+                $link = add_query_arg(
+                        array(
+                                'cpage' => $cpage,
+                                'foo'   => 'bar',
+                        ),
+                        get_permalink( self::$post_id )
+                );
+
+                $this->go_to( $link );
+                $expected = get_permalink( self::$post_id ) . '#comments';
+                $this->assertSame( $expected, wp_get_canonical_url( self::$post_id ) );
+        }
+
+        /**
          * Filter callback for testing of filter usage.
          *
          * @return string