Make sure sanitize_option() is always called when updating options.

git-svn-id: https://develop.svn.wordpress.org/trunk@5541 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/formatting.php

@@ -1118,4 +1118,72 @@ function wp_make_link_relative( $link ) {
 	return preg_replace('|https?://[^/]+(/.*)|i', '$1', $link );
 }
 
+function sanitize_option($option, $value) { // Remember to call stripslashes!
+
+	switch ($option) {
+		case 'admin_email':
+			$value = sanitize_email($value);
+			break;
+
+		case 'default_post_edit_rows':
+		case 'mailserver_port':
+		case 'comment_max_links':
+			$value = abs((int) $value);
+			break;
+
+		case 'posts_per_page':
+		case 'posts_per_rss':
+			$value = (int) $value;
+			if ( empty($value) ) $value = 1;
+			if ( $value < -1 ) $value = abs($value);
+			break;
+
+		case 'default_ping_status':
+		case 'default_comment_status':
+			// Options that if not there have 0 value but need to be something like "closed"
+			if ( $value == '0' || $value == '')
+				$value = 'closed';
+			break;
+
+		case 'blogdescription':
+		case 'blogname':
+			$value = addslashes($value);
+			$value = wp_filter_post_kses( $value ); // calls stripslashes then addslashes
+			$value = stripslashes($value);
+			$value = wp_specialchars( $value );
+			break;
+
+		case 'blog_charset':
+			$value = preg_replace('/[^a-zA-Z0-9_-]/', '', $value); // strips slashes
+			break;
+
+		case 'date_format':
+		case 'time_format':
+		case 'mailserver_url':
+		case 'mailserver_login':
+		case 'mailserver_pass':
+		case 'ping_sites':
+		case 'upload_path':
+			$value = strip_tags($value);
+			$value = addslashes($value);
+			$value = wp_filter_kses($value); // calls stripslashes then addslashes
+			$value = stripslashes($value);
+			break;
+
+		case 'gmt_offset':
+			$value = preg_replace('/[^0-9:.-]/', '', $value); // strips slashes
+			break;
+
+		case 'siteurl':
+		case 'home':
+			$value = stripslashes($value);
+			$value = clean_url($value);
+			break;
+		default :
+			break;
+	}
+
+	return $value;
+}
+
 ?>