Stefan Dirsch
dfc8bdecf3
* LZW decompress: fix for CVE-2011-2895 (bnc #709851) OBS-URL: https://build.opensuse.org/package/show/X11:XOrg/xorg-x11-libs?expand=0&rev=168
33 lines
1.0 KiB
Diff
33 lines
1.0 KiB
Diff
From d11ee5886e9d9ec610051a206b135a4cdc1e09a0 Mon Sep 17 00:00:00 2001
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From: Thomas Hoger <thoger@redhat.com>
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Date: Mon, 8 Aug 2011 18:03:09 +0200
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Subject: [PATCH] LZW decompress: fix for CVE-2011-2895
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Specially crafted LZW stream can crash an application using libXfont
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that is used to open untrusted font files. With X server, this may
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allow privilege escalation when exploited
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Reviewed-by: Matthieu Herrb <matthieu.herrb@laas.fr>
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Signed-off-by: Matthieu Herrb <matthieu.herrb@laas.fr>
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Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
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---
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src/fontfile/decompress.c | 2 ++
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1 files changed, 2 insertions(+), 0 deletions(-)
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diff --git a/src/fontfile/decompress.c b/src/fontfile/decompress.c
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index b1fc37b..c8171dd 100644
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--- a/src/fontfile/decompress.c
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+++ b/src/fontfile/decompress.c
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@@ -259,6 +259,8 @@ BufCompressedFill (BufFilePtr f)
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*/
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while ( code >= 256 )
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{
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+ if (stackp - de_stack >= STACK_SIZE - 1)
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+ return BUFFILEEOF;
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*stackp++ = file->tab_suffix[code];
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code = file->tab_prefix[code];
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}
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--
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1.7.4.1
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