dgram: handle close of dgram socket before DNS lookup completes

lib/dgram.js

@@ -175,7 +175,7 @@ Socket.prototype.send = function(buffer,
       if (callback) callback(err);
       self.emit('error', err);
     }
-    else {
+    else if (self._handle) {
       var req = self._handle.send(buffer, offset, length, port, ip);
       if (req) {
         req.oncomplete = afterSend;

test/simple/test-dgram-close.js

@@ -0,0 +1,35 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// Ensure that if a dgram socket is closed before the DNS lookup completes, it
+// won't crash.
+
+var assert = require('assert'),
+    common = require('../common'),
+    dgram = require('dgram');
+
+var buf = new Buffer(1024);
+buf.fill(42);
+
+var socket = dgram.createSocket('udp4');
+
+socket.send(buf, 0, buf.length, common.port, 'localhost');
+socket.close();