Ticket #30210: 30210.patch

src/wp-includes/functions.php

@@ -1130 +1130 @@
 function do_feed() {
         global $wp_query;
 
+        if ( ! $wp_query->have_posts() )
+                wp_die( __( 'ERROR: This is not a valid feed.' ), '', array( 'response' => 404 ) );
+
         $feed = get_query_var( 'feed' );
 
         // Remove the pad, if present.