From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Sun, 14 Jan 2018 00:55:04 +0000 (+0100)
Subject: Added check to avoid division by zero.
X-Git-Tag: 7.0.7-22~81
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=de8b85c78e7cf98debe7ab991d8eae2f9ed0611c;p=imagemagick

Added check to avoid division by zero.
Credit to OSS-Fuzz
---

diff --git a/MagickCore/enhance.c b/MagickCore/enhance.c
index bfabe7f4d..3e22fbd87 100644
--- a/MagickCore/enhance.c
+++ b/MagickCore/enhance.c
@@ -1446,11 +1446,14 @@ MagickExport Image *EnhanceImage(const Image *image,ExceptionInfo *exception)
       r=p+4*GetPixelChannels(image)*(image->columns+4);
       EnhancePixel(5.0); EnhancePixel(8.0); EnhancePixel(10.0);
         EnhancePixel(8.0); EnhancePixel(5.0);
-      pixel.red=((aggregate.red+total_weight/2.0)/total_weight);
-      pixel.green=((aggregate.green+total_weight/2.0)/total_weight);
-      pixel.blue=((aggregate.blue+total_weight/2.0)/total_weight);
-      pixel.black=((aggregate.black+total_weight/2.0)/total_weight);
-      pixel.alpha=((aggregate.alpha+total_weight/2.0)/total_weight);
+      if (total_weight > MagickEpsilon)
+        {
+          pixel.red=((aggregate.red+total_weight/2.0)/total_weight);
+          pixel.green=((aggregate.green+total_weight/2.0)/total_weight);
+          pixel.blue=((aggregate.blue+total_weight/2.0)/total_weight);
+          pixel.black=((aggregate.black+total_weight/2.0)/total_weight);
+          pixel.alpha=((aggregate.alpha+total_weight/2.0)/total_weight);
+        }
       SetPixelViaPixelInfo(image,&pixel,q);
       p+=GetPixelChannels(image);
       q+=GetPixelChannels(enhance_image);