package/p7zip: fix CVE-2016-9296

Signed-off-by: André Hentschel <nerv@dawncrow.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/p7zip/0001-CVE-2016-9296.patch

@@ -0,0 +1,25 @@
+From: Robert Luberda <robert@debian.org>
+Date: Sat, 19 Nov 2016 08:48:08 +0100
+Subject: Fix nullptr dereference (CVE-2016-9296)
+
+Patch taken from https://sourceforge.net/p/p7zip/bugs/185/
+
+Signed-off-by: André Hentschel <nerv@dawncrow.de>
+---
+ CPP/7zip/Archive/7z/7zIn.cpp | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/CPP/7zip/Archive/7z/7zIn.cpp b/CPP/7zip/Archive/7z/7zIn.cpp
+index b0c6b98..7c6dde2 100644
+--- a/CPP/7zip/Archive/7z/7zIn.cpp
++++ b/CPP/7zip/Archive/7z/7zIn.cpp
+@@ -1097,7 +1097,8 @@ HRESULT CInArchive::ReadAndDecodePackedStreams(
+       if (CrcCalc(data, unpackSize) != folders.FolderCRCs.Vals[i])
+         ThrowIncorrect();
+   }
+-  HeadersSize += folders.PackPositions[folders.NumPackStreams];
++  if (folders.PackPositions)
++      HeadersSize += folders.PackPositions[folders.NumPackStreams];
+   return S_OK;
+ }
+ 

package/p7zip/p7zip.mk

@@ -10,6 +10,9 @@ P7ZIP_SITE = http://downloads.sourceforge.net/project/p7zip/p7zip/$(P7ZIP_VERSIO
 P7ZIP_LICENSE = LGPL-2.1+ with unRAR restriction
 P7ZIP_LICENSE_FILES = DOC/License.txt
 
+# 0001-CVE-2016-9296.patch
+P7ZIP_IGNORE_CVES += CVE-2016-9296
+
 # p7zip buildsystem is a mess: it plays dirty tricks with CFLAGS and
 # CXXFLAGS, so we can't pass them. Instead, it accepts ALLFLAGS_C
 # and ALLFLAGS_CPP as variables to pass the CFLAGS and CXXFLAGS.