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