libtasn1: CVE-2015-3622

_asn1_extract_der_octet: prevent past of boundary access

References:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3622
http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=patch;
h=f979435823a02f842c41d49cd41cc81f25b5d677

(From OE-Core rev: 61bee3f813127c91d75a2af5197bdc874483a1fd)

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/gnutls/libtasn1/libtasn1-CVE-2015-3622.patch

@@ -0,0 +1,44 @@
+From f979435823a02f842c41d49cd41cc81f25b5d677 Mon Sep 17 00:00:00 2001
+From: Nikos Mavrogiannopoulos <nmav@redhat.com>
+Date: Mon, 20 Apr 2015 14:56:27 +0200
+Subject: [PATCH] _asn1_extract_der_octet: prevent past of boundary access
+
+Fixes CVE-2015-3622.
+Upstream-Status: Backport
+
+Reported by Hanno Böck.
+---
+ lib/decoding.c |    3 ++-
+ 1 files changed, 2 insertions(+), 1 deletions(-)
+
+diff --git a/lib/decoding.c b/lib/decoding.c
+index 7fbd931..42ddc6b 100644
+--- a/lib/decoding.c
++++ b/lib/decoding.c
+@@ -732,6 +732,7 @@ _asn1_extract_der_octet (asn1_node node, const unsigned char *der,
+     return ASN1_DER_ERROR;
+ 
+   counter = len3 + 1;
++  DECR_LEN(der_len, len3);
+ 
+   if (len2 == -1)
+     counter_end = der_len - 2;
+@@ -740,6 +741,7 @@ _asn1_extract_der_octet (asn1_node node, const unsigned char *der,
+ 
+   while (counter < counter_end)
+     {
++      DECR_LEN(der_len, 1);
+       len2 = asn1_get_length_der (der + counter, der_len, &len3);
+ 
+       if (IS_ERR(len2, flags))
+@@ -764,7 +766,6 @@ _asn1_extract_der_octet (asn1_node node, const unsigned char *der,
+ 	  len2 = 0;
+ 	}
+ 
+-      DECR_LEN(der_len, 1);
+       counter += len2 + len3 + 1;
+     }
+ 
+-- 
+1.7.2.5
+

meta/recipes-support/gnutls/libtasn1_4.0.bb

@@ -11,6 +11,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=d32239bcb673463ab874e80d47fae504 \
 SRC_URI = "${GNU_MIRROR}/libtasn1/libtasn1-${PV}.tar.gz \
            file://libtasn1_fix_for_automake_1.12.patch \
            file://dont-depend-on-help2man.patch \
+           file://libtasn1-CVE-2015-3622.patch \
            "
 
 SRC_URI[md5sum] = "d3d2d9bce3b6668b9827a9df52635be1"