Fixed busy loop in case of partially malformed rtcp packet

webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc

 /*
  *  Copyright (c) 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 139 matching lines @@
   rtc::scoped_ptr<RemoteBitrateEstimator> remote_bitrate_estimator_;
 };
 
 
 TEST_F(RtcpReceiverTest, BrokenPacketIsIgnored) {
   const uint8_t bad_packet[] = {0, 0, 0, 0};
   EXPECT_EQ(0, InjectRtcpPacket(bad_packet, sizeof(bad_packet)));
   EXPECT_EQ(0U, rtcp_packet_info_.rtcpPacketTypeFlags);
 }
 
+TEST_F(RtcpReceiverTest, InvalidFeedbackPacketIsIgnored) {
+  // Too short feedback packet.
+  const uint8_t bad_packet[] = {0x80, RTCPUtility::PT_RTPFB, 0, 0};
+  EXPECT_EQ(0, InjectRtcpPacket(bad_packet, sizeof(bad_packet)));
+  EXPECT_EQ(0U, rtcp_packet_info_.rtcpPacketTypeFlags);
+}
+
 TEST_F(RtcpReceiverTest, InjectSrPacket) {
   const uint32_t kSenderSsrc = 0x10203;
   rtcp::SenderReport sr;
   sr.From(kSenderSsrc);
   rtc::Buffer packet = sr.Build();
   EXPECT_EQ(0, InjectRtcpPacket(packet.data(), packet.size()));
   // The parser will note the remote SSRC on a SR from other than his
   // expected peer, but will not flag that he's gotten a packet.
   EXPECT_EQ(kSenderSsrc, rtcp_packet_info_.remoteSSRC);
   EXPECT_EQ(0U, kRtcpSr & rtcp_packet_info_.rtcpPacketTypeFlags);
@@ skipping 981 matching lines @@
 
   // Transport feedback should be ignored, but next packet should work.
   EXPECT_EQ(0u, rtcp_packet_info_.rtcpPacketTypeFlags & kRtcpTransportFeedback);
   EXPECT_NE(0u, rtcp_packet_info_.rtcpPacketTypeFlags & kRtcpRemb);
   EXPECT_EQ(kBitrateBps, rtcp_packet_info_.receiverEstimatedMaxBitrate);
 }
 
 }  // Anonymous namespace
 
 }  // namespace webrtc