libtasn1: fix CVE-2021-46848 off-by-one in asn1_encode_simple_der

Upstream-Status: Backport [44a700d205]

(From OE-Core rev: 305f1c56121436da7be39c5980fc11f779188ab7)

Signed-off-by: Vivek Kumbhar <vkumbhar@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/gnutls/libtasn1/CVE-2021-46848.patch

@@ -0,0 +1,45 @@
+From 22fd12b290adea788122044cb58dc9e77754644f Mon Sep 17 00:00:00 2001
+From: Vivek Kumbhar <vkumbhar@mvista.com>
+Date: Thu, 17 Nov 2022 12:07:50 +0530
+Subject: [PATCH] CVE-2021-46848
+
+Upstream-Status: Backport [https://gitlab.com/gnutls/libtasn1/-/commit/44a700d2051a666235748970c2df047ff207aeb5]
+CVE: CVE-2021-46848
+Signed-off-by: Vivek Kumbhar <vkumbhar@mvista.com>
+
+Fix ETYPE_OK off by one array size check.
+---
+ NEWS      | 4 ++++
+ lib/int.h | 2 +-
+ 2 files changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/NEWS b/NEWS
+index f042481..d8f684e 100644
+--- a/NEWS
++++ b/NEWS
+@@ -1,5 +1,9 @@
+ GNU Libtasn1 NEWS                                     -*- outline -*-
+ 
++* Noteworthy changes in release ?.? (????-??-??) [?]
++- Fix ETYPE_OK out of bounds read.  Closes: #32.
++- Update gnulib files and various maintenance fixes.
++
+ * Noteworthy changes in release 4.16.0 (released 2020-02-01) [stable]
+ - asn1_decode_simple_ber: added support for constructed definite
+   octet strings. This allows this function decode the whole set of
+diff --git a/lib/int.h b/lib/int.h
+index ea16257..c877282 100644
+--- a/lib/int.h
++++ b/lib/int.h
+@@ -97,7 +97,7 @@ typedef struct tag_and_class_st
+ #define ETYPE_TAG(etype) (_asn1_tags[etype].tag)
+ #define ETYPE_CLASS(etype) (_asn1_tags[etype].class)
+ #define ETYPE_OK(etype) (((etype) != ASN1_ETYPE_INVALID && \
+-                          (etype) <= _asn1_tags_size && \
++			   (etype) < _asn1_tags_size && \
+                           _asn1_tags[(etype)].desc != NULL)?1:0)
+ 
+ #define ETYPE_IS_STRING(etype) ((etype == ASN1_ETYPE_GENERALSTRING || \
+-- 
+2.25.1
+

meta/recipes-support/gnutls/libtasn1_4.16.0.bb

@@ -12,6 +12,7 @@ LIC_FILES_CHKSUM = "file://doc/COPYING;md5=d32239bcb673463ab874e80d47fae504 \
 
 SRC_URI = "${GNU_MIRROR}/libtasn1/libtasn1-${PV}.tar.gz \
            file://dont-depend-on-help2man.patch \
+           file://CVE-2021-46848.patch \
            "
 
 DEPENDS = "bison-native"