From 030c376fe4c97aea2178996e658b4c33aa9a736a Mon Sep 17 00:00:00 2001
From: cristy <cristy@aa41f4f7-0bf4-0310-aa73-e5a19afd5a74>
Date: Tue, 28 Oct 2014 13:11:48 +0000
Subject: Quit earlier in case of corrupted pnm image

Do not try to read a corrupted pnm file. Bail early.

Fix a segv and thus a DOS

git-svn-id: https://subversion.imagemagick.org/subversion/ImageMagick/branches/ImageMagick-6@16867 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
origin: http://trac.imagemagick.org/changeset/16867

diff --git a/coders/pnm.c b/coders/pnm.c
index 03f5fe5..1d6817e 100644
--- a/coders/pnm.c
+++ b/coders/pnm.c
@@ -411,7 +411,7 @@ static Image *ReadPNMImage(const ImageInfo *image_info,ExceptionInfo *exception)
       }
     if ((image->columns == 0) || (image->rows == 0))
       ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
-    if (max_value > 4294967295U)
+    if ((max_value == 0) || (max_value > 4294967295U))
       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
     for (depth=1; GetQuantumRange(depth) < max_value; depth++) ;
     image->depth=depth;
-- 
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