From 78f9d0757a51f909302a54caa021a2b3c20b4b7e Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Tue, 26 Feb 2008 10:05:05 +0000
Subject: [PATCH] Return error when requesting invalid feed format. Props
 pishmishy. fixes #5446

git-svn-id: https://develop.svn.wordpress.org/trunk@7038 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/functions.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index c2247eaa63..48f53f825b 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -901,7 +901,12 @@ function do_feed() {
 		$feed = get_default_feed();
 
 	$hook = 'do_feed_' . $feed;
-	do_action( $hook, $wp_query->is_comment_feed );
+	if ( !has_action($hook) ) {
+		$message = sprintf( __( 'ERROR: %s is not a valid feed template' ), wp_specialchars($feed));
+		wp_die($message);
+	}
+
+	do_action( $hook, $wp_query->is_comment_feed ); 
 }