From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Sat, 13 Jan 2018 02:12:18 +0000 (+0100)
Subject: Added check to avoid possible division by zero.
X-Git-Tag: 7.0.7-22~98
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=fdde85132c7024c7c4817155213c631811b579be;p=imagemagick

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

diff --git a/coders/sct.c b/coders/sct.c
index e9c3d1158..d6e0dabb7 100644
--- a/coders/sct.c
+++ b/coders/sct.c
@@ -214,6 +214,9 @@ static Image *ReadSCTImage(const ImageInfo *image_info,ExceptionInfo *exception)
   count=ReadBlob(image,768,buffer);
   if (separations_mask == 0x0f)
     SetImageColorspace(image,CMYKColorspace,exception);
+  if ((image->columns < 1) || (image->rows < 1) ||
+      (width < MagickEpsilon) || (height < MagickEpsilon))
+    ThrowReaderException(CorruptImageError,"ImproperImageHeader");
   image->resolution.x=1.0*image->columns/width;
   image->resolution.y=1.0*image->rows/height;
   if (image_info->ping != MagickFalse)