Fix out of bound reads in ParseIceServerUrl() for various input.

webrtc/api/peerconnection_unittest.cc

 /*
  *  Copyright 2012 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 2731 matching lines @@
   EXPECT_EQ(1U, turn_servers_.size());
   EXPECT_EQ(cricket::PROTO_TCP, turn_servers_[0].ports[0].proto);
   turn_servers_.clear();
 
   EXPECT_TRUE(ParseUrl("turn:hostname?transport=udp"));
   EXPECT_EQ(1U, turn_servers_.size());
   EXPECT_EQ(cricket::PROTO_UDP, turn_servers_[0].ports[0].proto);
   turn_servers_.clear();
 
   EXPECT_FALSE(ParseUrl("turn:hostname?transport=invalid"));
+  EXPECT_FALSE(ParseUrl("turn:hostname?transport="));
+  EXPECT_FALSE(ParseUrl("turn:hostname?="));
+  EXPECT_FALSE(ParseUrl("?"));
 }
 
 // Test parsing ICE username contained in URL.
 TEST_F(IceServerParsingTest, ParseUsername) {
   EXPECT_TRUE(ParseUrl("turn:user@hostname"));
   EXPECT_EQ(1U, turn_servers_.size());
   EXPECT_EQ("user", turn_servers_[0].credentials.username);
   turn_servers_.clear();
 
   EXPECT_FALSE(ParseUrl("turn:@hostname"));
@@ skipping 32 matching lines @@
   server.urls.push_back("turn:hostname2");
   servers.push_back(server);
   EXPECT_TRUE(webrtc::ParseIceServers(servers, &stun_servers_, &turn_servers_));
   EXPECT_EQ(2U, turn_servers_.size());
   EXPECT_NE(turn_servers_[0].priority, turn_servers_[1].priority);
 }
 
 #endif // if !defined(THREAD_SANITIZER)
 
 }  // namespace