From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Sun, 14 Jan 2018 00:20:15 +0000 (+0100)
Subject: Added ResetMagickMemory to fix reading from initialized memory.
X-Git-Tag: 7.0.7-22~87
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9e5ba050e85b4e1924577a7d21f9d7820deaec5a;p=imagemagick

Added ResetMagickMemory to fix reading from initialized memory.
Credit to OSS-Fuzz
---

diff --git a/coders/gif.c b/coders/gif.c
index 0ee58a1b4..a778a142d 100644
--- a/coders/gif.c
+++ b/coders/gif.c
@@ -227,6 +227,10 @@ static LZWInfo *AcquireLZWInfo(Image *image,const size_t data_size)
       lzw_info=RelinquishLZWInfo(lzw_info);
       return((LZWInfo *) NULL);
     }
+  (void) ResetMagickMemory(lzw_info->table[0],0,MaximumLZWCode*
+    sizeof(**lzw_info->table));
+  (void) ResetMagickMemory(lzw_info->table[1],0,MaximumLZWCode*
+    sizeof(**lzw_info->table));
   for (i=0; i <= (ssize_t) lzw_info->maximum_data_value; i++)
   {
     lzw_info->table[0][i]=0;