36 lines
1.3 KiB
Diff
36 lines
1.3 KiB
Diff
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From: =?utf-8?q?Antoine_Beaupr=C3=A9?= <anarcat@debian.org>
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Date: Fri, 2 Feb 2018 11:11:41 +0100
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Subject: Heap-based buffer overflow in 7zip/Compress/ShrinkDecoder.cpp
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Origin: vendor, https://sourceforge.net/p/p7zip/bugs/_discuss/thread/0920f369/27d7/attachment/CVE-2017-17969.patch
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Forwarded: https://sourceforge.net/p/p7zip/bugs/_discuss/thread/0920f369/#27d7
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Bug: https://sourceforge.net/p/p7zip/bugs/204/
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Bug-Debian: https://bugs.debian.org/888297
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-17969
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Reviewed-by: Salvatore Bonaccorso <carnil@debian.org>
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Last-Update: 2018-02-01
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Applied-Upstream: 18.00-beta
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---
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CPP/7zip/Compress/ShrinkDecoder.cpp | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/CPP/7zip/Compress/ShrinkDecoder.cpp b/CPP/7zip/Compress/ShrinkDecoder.cpp
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index 80b7e67..ca37764 100644
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--- a/CPP/7zip/Compress/ShrinkDecoder.cpp
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+++ b/CPP/7zip/Compress/ShrinkDecoder.cpp
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@@ -121,8 +121,13 @@ HRESULT CDecoder::CodeReal(ISequentialInStream *inStream, ISequentialOutStream *
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{
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_stack[i++] = _suffixes[cur];
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cur = _parents[cur];
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+ if (cur >= kNumItems || i >= kNumItems)
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+ break;
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}
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-
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+
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+ if (cur >= kNumItems || i >= kNumItems)
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+ break;
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+
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_stack[i++] = (Byte)cur;
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lastChar2 = (Byte)cur;
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