From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Fri, 13 Apr 2018 07:50:14 +0000 (+0200)
Subject: Fixed check that determines if enough bytes are read (https://bugs.chromium.org/p... 
X-Git-Tag: 7.0.7-29~125
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=73c0e9d0818fd6dce4bc891f6fc839ca92455db5;p=imagemagick

Fixed check that determines if enough bytes are read (https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7502).
---

diff --git a/coders/icon.c b/coders/icon.c
index f7bb8a89a..677380ab5 100644
--- a/coders/icon.c
+++ b/coders/icon.c
@@ -369,7 +369,7 @@ static Image *ReadICONImage(const ImageInfo *image_info,
         png[15]=(unsigned char) (icon_info.bits_per_pixel >> 8);
         count=ReadBlob(image,length-16,png+16);
         icon_image=(Image *) NULL;
-        if (count > 0)
+        if (count == (ssize_t) length-16)
           {
             read_info=CloneImageInfo(image_info);
             (void) CopyMagickString(read_info->magick,"PNG",MagickPathExtent);