From d0c4c4c3348f28ea263296bede4912049344af64 Mon Sep 17 00:00:00 2001
From: Andrew Nacin <nacin@git.wordpress.org>
Date: Sat, 20 Jul 2013 20:16:21 +0000
Subject: [PATCH] Check that we have a database connection in
 wpdb::_real_escape(). see #24773.

git-svn-id: https://develop.svn.wordpress.org/trunk@24758 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/wp-db.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index 16230ae493..4f5a97eb47 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -876,7 +876,12 @@ class wpdb {
 	 * @return string escaped
 	 */
 	function _real_escape( $string ) {
-		return mysql_real_escape_string( $string, $this->dbh );
+		if ( $this->dbh )
+			return mysql_real_escape_string( $string, $this->dbh );
+
+		$class = get_class( $this );
+		_doing_it_wrong( $class, "$class must set a database connection for use with escaping.", E_USER_NOTICE );
+		return addslashes( $string );
 	}
 
 	/**