Potential division by zero in RtpToNtpMs()

webrtc/system_wrappers/source/rtp_to_ntp.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 53 matching lines @@
     return false;
   }
 
   RtcpMeasurement measurement;
   measurement.ntp_secs = ntp_secs;
   measurement.ntp_frac = ntp_frac;
   measurement.rtp_timestamp = rtp_timestamp;
 
   for (RtcpList::iterator it = rtcp_list->begin();
        it != rtcp_list->end(); ++it) {
-    if (measurement.ntp_secs == (*it).ntp_secs &&
-        measurement.ntp_frac == (*it).ntp_frac) {
+    if ((measurement.ntp_secs == (*it).ntp_secs &&
+         measurement.ntp_frac == (*it).ntp_frac) ||
+        (measurement.rtp_timestamp == (*it).rtp_timestamp)) {
       // This RTCP has already been added to the list.
       return true;
     }
   }
 
   // We need two RTCP SR reports to map between RTP and NTP. More than two will
   // not improve the mapping.
   if (rtcp_list->size() == 2) {
     rtcp_list->pop_back();
   }
@@ skipping 57 matching lines @@
     }
   } else if (static_cast<int32_t>(old_timestamp - new_timestamp) > 0) {
     // This difference should be less than -2^31 if we have had a backward wrap
     // around. Since it is cast to a int32_t, it should be positive.
     return -1;
   }
   return 0;
 }
 
 }  // namespace webrtc