From 00e5822e17843fe97169db68ed6076d98c1d46ad Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@users.mediawiki.org>
Date: Thu, 29 Apr 2004 04:42:52 +0000
Subject: [PATCH] Don't create thumbnail images larger than the image; use the
 source image itself if asked. Reject attempts at zero or negative-width
 thumbs.

---
 includes/Image.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/includes/Image.php b/includes/Image.php
index 27ad21e326..ed69912a61 100644
--- a/includes/Image.php
+++ b/includes/Image.php
@@ -103,6 +103,17 @@ class Image
 			# If there is no image, there will be no thumbnail
 			return "";
 		}
+		
+		# Sanity check $width
+		$width = IntVal( $width );
+		if( $width <= 0 ) {
+			# BZZZT
+			return "";
+		}
+		if( $width > $this->width ) {
+			# Don't make an image bigger than the source
+			return $this->getURL();
+		}
 
 		if (    (! file_exists( $thumbPath ) )
 		     || ( filemtime($thumbPath) < filemtime($this->imagePath) ) ) {
-- 
2.20.1