PKGBUILDs/extra/p7zip/CVE-2017-17969.patch

From 79bca880ce7bcf07216c45f93afea545e0344418 Mon Sep 17 00:00:00 2001
From: aone <aone@keka.io>
Date: Mon, 5 Feb 2018 13:01:09 +0100
Subject: [PATCH] Security fix CVE-2017-17969

---
 CPP/7zip/Compress/ShrinkDecoder.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CPP/7zip/Compress/ShrinkDecoder.cpp b/CPP/7zip/Compress/ShrinkDecoder.cpp
index 80b7e67..5bb0559 100644
--- a/CPP/7zip/Compress/ShrinkDecoder.cpp
+++ b/CPP/7zip/Compress/ShrinkDecoder.cpp
@@ -121,7 +121,12 @@ 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;