fix(p7zip): fix CVE-2017-17969

Signed-off-by: Radovan Scasny <radovan.scasny@siemens.com>
Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-extended/p7zip/files/CVE-2017-17969.patch

@@ -0,0 +1,31 @@
+p7zip: Fix CVE-2017-17969
+
+[No upstream tracking] -- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=888297
+
+Heap-based buffer overflow in 7zip
+
+Compress/ShrinkDecoder.cpp: Heap-based buffer overflow
+in the NCompress::NShrink::CDecoder::CodeReal method
+in 7-Zip before 18.00 and p7zip allows remote attackers
+to cause a denial of service (out-of-bounds write)
+or potentially execute arbitrary code via a crafted ZIP archive. 
+
+Upstream-Status: Backport [https://sourceforge.net/p/p7zip/bugs/_discuss/thread/0920f369/8316/attachment/CVE-2017-17969.patch]
+CVE: CVE-2017-17969
+Signed-off-by: Radovan Scasny <radovan.scasny@siemens.com>
+
+--- 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;

meta-oe/recipes-extended/p7zip/p7zip_16.02.bb

@@ -6,7 +6,8 @@ LIC_FILES_CHKSUM = "file://DOC/copying.txt;md5=4fbd65380cdd255951079008b364516c
                     file://DOC/License.txt;md5=879598edf1f54dddb6930d7581357f8b"
 
 SRC_URI = "http://downloads.sourceforge.net/p7zip/p7zip/${PV}/p7zip_${PV}_src_all.tar.bz2 \
-          file://do_not_override_compiler_and_do_not_strip.patch"
+          file://do_not_override_compiler_and_do_not_strip.patch \
+          file://CVE-2017-17969.patch"
 
 SRC_URI[md5sum] = "a0128d661cfe7cc8c121e73519c54fbf"
 SRC_URI[sha256sum] = "5eb20ac0e2944f6cb9c2d51dd6c4518941c185347d4089ea89087ffdd6e2341f"