From: Cristy <urban-warrior@imagemagick.org>
Date: Wed, 28 Mar 2018 00:39:27 +0000 (-0400)
Subject: https://github.com/ImageMagick/ImageMagick/issues/1009
X-Git-Tag: 7.0.7-29~282
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=361ed689cc8e56fd125f9d0d6508e9eb303bdca6;p=imagemagick

https://github.com/ImageMagick/ImageMagick/issues/1009
---

diff --git a/coders/webp.c b/coders/webp.c
index fffccd77e..22f662bae 100644
--- a/coders/webp.c
+++ b/coders/webp.c
@@ -181,6 +181,8 @@ static MagickBooleanType IsWEBPImageLossless(const unsigned char *stream,
   /*
     Read simple header.
   */
+  if (length <= VP8_CHUNK_INDEX)
+    return(MagickFalse);
   if (stream[VP8_CHUNK_INDEX] != EXTENDED_HEADER)
     return(stream[VP8_CHUNK_INDEX] == LOSSLESS_FLAG ? MagickTrue : MagickFalse);
   /*