GetDefaultLocalAddress should return false when the address is invalid

webrtc/base/network.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 327 matching lines @@
   if (ipv4.family() == AF_INET) {
     default_local_ipv4_address_ = ipv4;
   }
   if (ipv6.family() == AF_INET6) {
     default_local_ipv6_address_ = ipv6;
   }
 }
 
 bool NetworkManagerBase::GetDefaultLocalAddress(int family,
                                                 IPAddress* ipaddr) const {
-  if (family == AF_INET) {
+  if (family == AF_INET && !default_local_ipv4_address_.IsNil()) {
     *ipaddr = default_local_ipv4_address_;
     return true;
-  } else if (family == AF_INET6) {
+  } else if (family == AF_INET6 && !default_local_ipv6_address_.IsNil()) {
     *ipaddr = default_local_ipv6_address_;
     return true;
   }
   return false;
 }
 
 BasicNetworkManager::BasicNetworkManager()
     : thread_(NULL), sent_first_update_(false), start_count_(0),
       network_ignore_mask_(kDefaultNetworkIgnoreMask),
       ignore_non_default_routes_(false) {
@@ skipping 549 matching lines @@
   std::stringstream ss;
   // Print out the first space-terminated token of the network desc, plus
   // the IP address.
   ss << "Net[" << description_.substr(0, description_.find(' '))
      << ":" << prefix_.ToSensitiveString() << "/" << prefix_length_
      << ":" << AdapterTypeToString(type_) << "]";
   return ss.str();
 }
 
 }  // namespace rtc