From: Cristy <urban-warrior@imagemagick.org>
Date: Fri, 23 Feb 2018 10:15:02 +0000 (-0500)
Subject: https://github.com/ImageMagick/ImageMagick/issues/998
X-Git-Tag: 7.0.7-24~23
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9e80713e5132a3bd26702ee0a833306f7e801469;p=imagemagick

https://github.com/ImageMagick/ImageMagick/issues/998
---

diff --git a/coders/webp.c b/coders/webp.c
index 17e071b12..fffccd77e 100644
--- a/coders/webp.c
+++ b/coders/webp.c
@@ -187,7 +187,7 @@ static MagickBooleanType IsWEBPImageLossless(const unsigned char *stream,
     Read extended header.
   */
   offset=RIFF_HEADER_SIZE+TAG_SIZE+CHUNK_SIZE_BYTES+VP8X_CHUNK_SIZE;
-  while (offset <= (ssize_t) length)
+  while (offset <= (ssize_t) (length-TAG_SIZE))
   {
     uint32_t
       chunk_size,