* ext/openssl/ossl_asn1.c: Forbid Constructive without infinite

length. This also prevents a segfault. Added test and improved
documentation.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31701 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/openssl/test_asn1.rb

@@ -243,6 +243,17 @@ class  OpenSSL::TestASN1 < Test::Unit::TestCase
     assert_equal(raw, asn1.to_der)
   end
 
+  def test_cons_without_inf_length_forbidden
+    assert_raise(OpenSSL::ASN1::ASN1Error) do
+      val = OpenSSL::ASN1::OctetString.new('a')
+      cons = OpenSSL::ASN1::Constructive.new([val],
+                                            OpenSSL::ASN1::OCTET_STRING,
+                                            nil,
+                                            :UNIVERSAL)
+      cons.to_der
+    end
+  end
+
   def test_seq_infinite_length
     begin
       content = [ OpenSSL::ASN1::Null.new(nil),