23 lines
618 B
Text
23 lines
618 B
Text
$NetBSD: patch-CVE-2017-17969,v 1.1 2019/07/18 10:03:26 nia Exp $
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Fix CVE-2017-17969 - heap-based buffer overflow
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From https://sourceforge.net/p/p7zip/bugs/204/
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--- CPP/7zip/Compress/ShrinkDecoder.cpp.orig 2016-05-18 17:31:02.000000000 +0000
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+++ 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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