socket.c: null byte at Socket.getnameinfo

* ext/socket/socket.c (sock_s_getnameinfo): check null byte.
  patched by tommy (Masahiro Tomita) in [ruby-dev:50286].
  [Bug #13994]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60162 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/socket/socket.c

@@ -1287,7 +1287,7 @@ sock_s_getnameinfo(int argc, VALUE *argv)
 	    hptr = NULL;
 	}
 	else {
-	    strncpy(hbuf, StringValuePtr(host), sizeof(hbuf));
+	    strncpy(hbuf, StringValueCStr(host), sizeof(hbuf));
 	    hbuf[sizeof(hbuf) - 1] = '\0';
 	    hptr = hbuf;
 	}
@@ -1301,7 +1301,7 @@ sock_s_getnameinfo(int argc, VALUE *argv)
 	    pptr = pbuf;
 	}
 	else {
-	    strncpy(pbuf, StringValuePtr(port), sizeof(pbuf));
+	    strncpy(pbuf, StringValueCStr(port), sizeof(pbuf));
 	    pbuf[sizeof(pbuf) - 1] = '\0';
 	    pptr = pbuf;
 	}

test/socket/test_socket.rb

@@ -105,6 +105,8 @@ class TestSocket < Test::Unit::TestCase
 
   def test_getnameinfo
     assert_raise(SocketError) { Socket.getnameinfo(["AF_UNIX", 80, "0.0.0.0"]) }
+    assert_raise(ArgumentError) {Socket.getnameinfo(["AF_INET", "http\0", "example.net"])}
+    assert_raise(ArgumentError) {Socket.getnameinfo(["AF_INET", "http", "example.net\0"])}
   end
 
   def test_ip_address_list