gnu: libtasn1: Fix CVE-2017-10790.

* gnu/packages/patches/libtasn1-CVE-2017-10790.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/tls.scm (libtasn1/fixed)[source]: Use it.

gnu/local.mk

@@ -775,6 +775,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/libssh2-fix-build-failure-with-gcrypt.patch	\
   %D%/packages/patches/libtar-CVE-2013-4420.patch 		\
   %D%/packages/patches/libtasn1-CVE-2017-6891.patch 		\
+  %D%/packages/patches/libtasn1-CVE-2017-10790.patch 		\
   %D%/packages/patches/libtheora-config-guess.patch		\
   %D%/packages/patches/libtiff-CVE-2016-10092.patch		\
   %D%/packages/patches/libtiff-CVE-2016-10093.patch		\

gnu/packages/patches/libtasn1-CVE-2017-10790.patch

@@ -0,0 +1,63 @@
+Fix CVE-2017-10790:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10790
+
+Patch copied from upstream source repository:
+
+https://git.savannah.nongnu.org/cgit/libtasn1.git/commit/?id=d8d805e1f2e6799bb2dff4871a8598dc83088a39
+
+From d8d805e1f2e6799bb2dff4871a8598dc83088a39 Mon Sep 17 00:00:00 2001
+From: Nikos Mavrogiannopoulos <nmav@redhat.com>
+Date: Thu, 22 Jun 2017 16:31:37 +0200
+Subject: [PATCH] _asn1_check_identifier: safer access to values read
+
+Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>
+---
+ lib/parser_aux.c | 17 ++++++++++++-----
+ 1 file changed, 12 insertions(+), 5 deletions(-)
+
+diff --git a/lib/parser_aux.c b/lib/parser_aux.c
+index 976ab38..786ea64 100644
+--- a/lib/parser_aux.c
++++ b/lib/parser_aux.c
+@@ -955,7 +955,7 @@ _asn1_check_identifier (asn1_node node)
+ 	  if (p2 == NULL)
+ 	    {
+ 	      if (p->value)
+-		_asn1_strcpy (_asn1_identifierMissing, p->value);
++		_asn1_str_cpy (_asn1_identifierMissing, sizeof(_asn1_identifierMissing), (char*)p->value);
+ 	      else
+ 		_asn1_strcpy (_asn1_identifierMissing, "(null)");
+ 	      return ASN1_IDENTIFIER_NOT_FOUND;
+@@ -968,9 +968,15 @@ _asn1_check_identifier (asn1_node node)
+ 	  if (p2 && (type_field (p2->type) == ASN1_ETYPE_DEFAULT))
+ 	    {
+ 	      _asn1_str_cpy (name2, sizeof (name2), node->name);
+-	      _asn1_str_cat (name2, sizeof (name2), ".");
+-	      _asn1_str_cat (name2, sizeof (name2), (char *) p2->value);
+-	      _asn1_strcpy (_asn1_identifierMissing, p2->value);
++	      if (p2->value)
++	        {
++	          _asn1_str_cat (name2, sizeof (name2), ".");
++	          _asn1_str_cat (name2, sizeof (name2), (char *) p2->value);
++	          _asn1_str_cpy (_asn1_identifierMissing, sizeof(_asn1_identifierMissing), (char*)p2->value);
++	        }
++	      else
++		_asn1_strcpy (_asn1_identifierMissing, "(null)");
++
+ 	      p2 = asn1_find_node (node, name2);
+ 	      if (!p2 || (type_field (p2->type) != ASN1_ETYPE_OBJECT_ID) ||
+ 		  !(p2->type & CONST_ASSIGN))
+@@ -990,7 +996,8 @@ _asn1_check_identifier (asn1_node node)
+ 		  _asn1_str_cpy (name2, sizeof (name2), node->name);
+ 		  _asn1_str_cat (name2, sizeof (name2), ".");
+ 		  _asn1_str_cat (name2, sizeof (name2), (char *) p2->value);
+-		  _asn1_strcpy (_asn1_identifierMissing, p2->value);
++		  _asn1_str_cpy (_asn1_identifierMissing, sizeof(_asn1_identifierMissing), (char*)p2->value);
++
+ 		  p2 = asn1_find_node (node, name2);
+ 		  if (!p2 || (type_field (p2->type) != ASN1_ETYPE_OBJECT_ID)
+ 		      || !(p2->type & CONST_ASSIGN))
+-- 
+2.13.3
+

gnu/packages/tls.scm

@@ -81,7 +81,8 @@ (define libtasn1/fixed
       (origin
         (inherit (package-source libtasn1))
         (patches
-          (search-patches "libtasn1-CVE-2017-6891.patch"))))))
+          (search-patches "libtasn1-CVE-2017-6891.patch"
+                          "libtasn1-CVE-2017-10790.patch"))))))
 
 (define-public asn1c
   (package