Don't send a QUIC SCUP message until after handshake confirmed.

net/quic/quic_crypto_server_stream.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_crypto_server_stream.h"
 
 #include "base/base64.h"
 #include "crypto/secure_hash.h"
 #include "net/quic/crypto/crypto_protocol.h"
 #include "net/quic/crypto/crypto_utils.h"
@@ skipping 140 matching lines @@
   handshake_confirmed_ = true;
   session()->OnCryptoHandshakeEvent(QuicSession::HANDSHAKE_CONFIRMED);
 
   // Now that the handshake is complete, send an updated server config and
   // source-address token to the client.
   SendServerConfigUpdate(NULL);
 }
 
 void QuicCryptoServerStream::SendServerConfigUpdate(
     const CachedNetworkParameters* cached_network_params) {
-  if (session()->connection()->version() <= QUIC_VERSION_21) {
+  if (session()->connection()->version() <= QUIC_VERSION_21 ||
+      !handshake_confirmed_) {
     return;
   }
 
   CryptoHandshakeMessage server_config_update_message;
   if (!crypto_config_.BuildServerConfigUpdateMessage(
           session()->connection()->peer_address(),
           session()->connection()->clock(),
           session()->connection()->random_generator(),
           crypto_negotiated_params_,
           cached_network_params,
@@ skipping 73 matching lines @@
 
 void QuicCryptoServerStream::ValidateCallback::RunImpl(
     const CryptoHandshakeMessage& client_hello,
     const Result& result) {
   if (parent_ != NULL) {
     parent_->FinishProcessingHandshakeMessage(client_hello, result);
   }
 }
 
 }  // namespace net