Check return value of GetStringPiece for (optional) kCCRT/kCCS in

net/quic/crypto/quic_crypto_server_config.cc

 // Copyright 2013 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/crypto/quic_crypto_server_config.h"
 
 #include <stdlib.h>
 #include <algorithm>
 
 #include "base/stl_util.h"
@@ skipping 1121 matching lines @@
 
   const vector<string>* certs;
   string signature;
   if (!proof_source_->GetProof(info.sni.as_string(), config.serialized,
                                params->x509_ecdsa_supported, &certs,
                                &signature)) {
     return;
   }
 
   StringPiece client_common_set_hashes;
-  client_hello.GetStringPiece(kCCS, &client_common_set_hashes);
-  params->client_common_set_hashes = client_common_set_hashes.as_string();
+  if (client_hello.GetStringPiece(kCCS, &client_common_set_hashes)) {
+    params->client_common_set_hashes = client_common_set_hashes.as_string();
+  }
 
   StringPiece client_cached_cert_hashes;
-  client_hello.GetStringPiece(kCCRT, &client_cached_cert_hashes);
-  params->client_cached_cert_hashes = client_cached_cert_hashes.as_string();
+  if (client_hello.GetStringPiece(kCCRT, &client_cached_cert_hashes)) {
+    params->client_cached_cert_hashes = client_cached_cert_hashes.as_string();
+  }
 
   const string compressed = CertCompressor::CompressChain(
       *certs, params->client_common_set_hashes,
       params->client_cached_cert_hashes, config.common_cert_sets);
 
   // kREJOverheadBytes is a very rough estimate of how much of a REJ
   // message is taken up by things other than the certificates.
   // STK: 56 bytes
   // SNO: 56 bytes
   // SCFG
@@ skipping 394 matching lines @@
 QuicCryptoServerConfig::Config::Config()
     : channel_id_enabled(false),
       is_primary(false),
       primary_time(QuicWallTime::Zero()),
       priority(0),
       source_address_token_boxer(NULL) {}
 
 QuicCryptoServerConfig::Config::~Config() { STLDeleteElements(&key_exchanges); }
 
 }  // namespace net