36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
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Fix CVE-2017-17969:
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https://sourceforge.net/p/p7zip/bugs/204/
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17969
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Patch copied from Debian.
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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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Author: Antoine Beaupré <anarcat@debian.org>
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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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--- 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(ISequentialIn
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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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