[pixel@mandriva.com: segfault on buggy .gif + patch to fix it]

* [pixel@mandriva.com: segfault on buggy .gif + patch to fix it]
@ 2007-09-07  6:31 Richard Stallman
  2007-09-07  7:11 ` Thien-Thi Nguyen
  0 siblings, 1 reply; 6+ messages in thread
From: Richard Stallman @ 2007-09-07  6:31 UTC (permalink / raw)
  To: emacs-devel

Would someone please check this patch, and either install
it and ack or expain why it is wrong?


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To: bug-gnu-emacs@gnu.org
From: Pixel <pixel@mandriva.com>
Date: Thu, 06 Sep 2007 16:00:09 +0200
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Subject: segfault on buggy .gif + patch to fix it

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download http://people.mandriva.com/~prigaux/content.gif
(file not attached here for gnus users out there...)

then do "emacs content.gif" in X mode, it will segfault.

here is a simple patch to fix the issue:


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 filename=emacs-snapshot-fix-segfault-loading-wrong-gif.patch

Index: src/image.c
===================================================================
RCS file: /sources/emacs/emacs/src/image.c,v
retrieving revision 1.85
diff -u -r1.85 image.c
- --- src/image.c	30 Aug 2007 05:05:58 -0000	1.85
+++ src/image.c	6 Sep 2007 13:56:19 -0000
@@ -7886,7 +7886,8 @@
   init_color_table ();
   bzero (pixel_colors, sizeof pixel_colors);
 
- -  for (i = 0; i < gif_color_map->ColorCount; ++i)
+  if (gif_color_map)
+    for (i = 0; i < gif_color_map->ColorCount; ++i)
     {
       int r = gif_color_map->Colors[i].Red << 8;
       int g = gif_color_map->Colors[i].Green << 8;

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reproduced on:
  GNU Emacs 22.1.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars) of 2007-08-22 on raven, modified by Debian
  GNU Emacs 22.1.1 (i386-mandrake-linux-gnu, X toolkit, Xaw3d scroll bars) of 2007-09-06 on n4.mandriva.com, modified by Mandriva
  GNU Emacs 23.0.50.3 (i686-pc-linux-gnu, GTK+ Version 2.11.6, multi-tty) of 2007-09-06 on n4.mandriva.com

the buggy gif comes from a MMS by SFR (a french mobile phone operator)

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