gnutls: Backport certificate check fix

Previously the OCSP certificate check wouldn't verify the serial
length and could succeed in cases it shouldn't (CVE-2016-7444).

(From OE-Core rev: d7e97992befd3fa5c1c6616652a3aa723d08c531)

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/gnutls/gnutls/CVE-2016-7444.patch

@@ -0,0 +1,35 @@
+CVE: CVE-2016-7444
+Upstream-Status: Backport
+Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
+
+Upstream commit follows:
+
+
+From 964632f37dfdfb914ebc5e49db4fa29af35b1de9 Mon Sep 17 00:00:00 2001
+From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
+Date: Sat, 27 Aug 2016 17:00:22 +0200
+Subject: [PATCH] ocsp: corrected the comparison of the serial size in OCSP response
+
+Previously the OCSP certificate check wouldn't verify the serial length
+and could succeed in cases it shouldn't.
+
+Reported by Stefan Buehler.
+---
+ lib/x509/ocsp.c | 1 +
+ 1 file changed, 1 insertion(+), 0 deletions(-)
+
+diff --git a/lib/x509/ocsp.c b/lib/x509/ocsp.c
+index 92db9b6..8181f2e 100644
+--- a/lib/x509/ocsp.c
++++ b/lib/x509/ocsp.c
+@@ -1318,6 +1318,7 @@ gnutls_ocsp_resp_check_crt(gnutls_ocsp_resp_t resp,
+ 		gnutls_assert();
+ 		goto cleanup;
+ 	}
++	cserial.size = t;
+ 
+ 	if (rserial.size != cserial.size
+ 	    || memcmp(cserial.data, rserial.data, rserial.size) != 0) {
+--
+libgit2 0.24.0
+

meta/recipes-support/gnutls/gnutls_3.5.3.bb

@@ -4,6 +4,7 @@ SRC_URI += "file://correct_rpl_gettimeofday_signature.patch \
             file://0001-configure.ac-fix-sed-command.patch \
             file://use-pkg-config-to-locate-zlib.patch \
             file://0001-Use-correct-include-dir-with-minitasn.patch \
+            file://CVE-2016-7444.patch \
            "
 SRC_URI[md5sum] = "6c2c7f40ddf52933ee3ca474cb8cb63c"
 SRC_URI[sha256sum] = "92c4bc999a10a1b95299ebefaeea8333f19d8a98d957a35b5eae74881bdb1fef"