xorg-x11-libs/U_libXfont_LZW-decompress-fix-for-CVE-2011-2895.patch

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From d11ee5886e9d9ec610051a206b135a4cdc1e09a0 Mon Sep 17 00:00:00 2001
From: Thomas Hoger <thoger@redhat.com>
Date: Mon, 8 Aug 2011 18:03:09 +0200
Subject: [PATCH] LZW decompress: fix for CVE-2011-2895
Specially crafted LZW stream can crash an application using libXfont
that is used to open untrusted font files. With X server, this may
allow privilege escalation when exploited
Reviewed-by: Matthieu Herrb <matthieu.herrb@laas.fr>
Signed-off-by: Matthieu Herrb <matthieu.herrb@laas.fr>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
src/fontfile/decompress.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/src/fontfile/decompress.c b/src/fontfile/decompress.c
index b1fc37b..c8171dd 100644
--- a/src/fontfile/decompress.c
+++ b/src/fontfile/decompress.c
@@ -259,6 +259,8 @@ BufCompressedFill (BufFilePtr f)
*/
while ( code >= 256 )
{
+ if (stackp - de_stack >= STACK_SIZE - 1)
+ return BUFFILEEOF;
*stackp++ = file->tab_suffix[code];
code = file->tab_prefix[code];
}
--
1.7.4.1