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<p class="MsoNormal">Dear Ross Finlayson,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There may be an assertion violation bug.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When sending multiple SETUP and PLAY commands, the live555 may violate this assertion: liveMedia/FramedSource.cpp:65<o:p></o:p></p>
<p class="MsoNormal">Then it outputs “FramedSource[0x610000000440]::getNextFrame(): attempting to read more than once at the same time!” and aborts itself.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The call stack of the exit point:<o:p></o:p></p>
<p class="MsoNormal"> #6 0x64fafa in UsageEnvironment::internalError() /home/ubuntu/experiments/live555-libfuzzer/UsageEnvironment/UsageEnvironment.cpp:42:3<o:p></o:p></p>
<p class="MsoNormal"> #7 0x5502d5 in FramedSource::getNextFrame(unsigned char*, unsigned int, void (*)(void*, unsigned int, unsigned int, timeval, unsigned int), void*, void (*)(void*), void*) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/FramedSource.cpp:65:13<o:p></o:p></p>
<p class="MsoNormal"> #8 0x613e63 in StreamParser::ensureValidBytes1(unsigned int) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/StreamParser.cpp:156:17<o:p></o:p></p>
<p class="MsoNormal"> #9 0x558f35 in StreamParser::ensureValidBytes(unsigned int) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/./StreamParser.hh:125:5<o:p></o:p></p>
<p class="MsoNormal"> #10 0x558f35 in StreamParser::test4Bytes() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/./StreamParser.hh:54:5<o:p></o:p></p>
<p class="MsoNormal"> #11 0x558f35 in MPEGProgramStreamParser::parsePackHeader() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MPEG1or2Demux.cpp:397:19<o:p></o:p></p>
<p class="MsoNormal"> #12 0x557b6e in MPEGProgramStreamParser::parse() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MPEG1or2Demux.cpp:358:2<o:p></o:p></p>
<p class="MsoNormal"> #13 0x557b6e in MPEG1or2Demux::continueReadProcessing() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MPEG1or2Demux.cpp:236:50<o:p></o:p></p>
<p class="MsoNormal"> #14 0x55c946 in MPEG1or2DemuxedElementaryStream::doGetNextFrame() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MPEG1or2DemuxedElementaryStream.cpp:45:19<o:p></o:p></p>
<p class="MsoNormal"> #15 0x613e63 in StreamParser::ensureValidBytes1(unsigned int) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/StreamParser.cpp:156:17<o:p></o:p></p>
<p class="MsoNormal"> #16 0x572bb6 in StreamParser::ensureValidBytes(unsigned int) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/./StreamParser.hh:125:5<o:p></o:p></p>
<p class="MsoNormal"> #17 0x572bb6 in StreamParser::test4Bytes() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/./StreamParser.hh:54:5<o:p></o:p></p>
<p class="MsoNormal"> #18 0x572bb6 in MPEG1or2AudioStreamParser::parse(unsigned int&) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MPEG1or2AudioStreamFramer.cpp:184:34<o:p></o:p></p>
<p class="MsoNormal"> #19 0x571f8f in MPEG1or2AudioStreamFramer::continueReadProcessing() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MPEG1or2AudioStreamFramer.cpp:134:41<o:p></o:p></p>
<p class="MsoNormal"> #20 0x571f8f in MPEG1or2AudioStreamFramer::doGetNextFrame() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MPEG1or2AudioStreamFramer.cpp:94:3<o:p></o:p></p>
<p class="MsoNormal"> #21 0x5d1ac4 in MultiFramedRTPSink::packFrame() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MultiFramedRTPSink.cpp:223:14<o:p></o:p></p>
<p class="MsoNormal"> #22 0x5d11b4 in MultiFramedRTPSink::buildAndSendPacket(unsigned char) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MultiFramedRTPSink.cpp:199:3<o:p></o:p></p>
<p class="MsoNormal"> #23 0x5d11b4 in MultiFramedRTPSink::continuePlaying() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/MultiFramedRTPSink.cpp:159:3<o:p></o:p></p>
<p class="MsoNormal"> #24 0x5e8085 in StreamState::startPlaying(Destinations*, unsigned int, void (*)(void*), void*, void (*)(void*, unsigned char), void*) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/OnDemandServerMediaSubsession.cpp:558:17<o:p></o:p></p>
<p class="MsoNormal"> #25 0x5e7796 in OnDemandServerMediaSubsession::startStream(unsigned int, void*, void (*)(void*), void*, unsigned short&, unsigned int&, void (*)(void*, unsigned char), void*) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/OnDemandServerMediaSubsession.cpp:215:18<o:p></o:p></p>
<p class="MsoNormal"> #26 0x4e75c0 in RTSPServer::RTSPClientSession::handleCmd_PLAY(RTSPServer::RTSPClientConnection*, ServerMediaSubsession*, char const*) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/RTSPServer.cpp:1861:36<o:p></o:p></p>
<p class="MsoNormal"> #27 0x4e569e in RTSPServer::RTSPClientSession::handleCmd_withinSession(RTSPServer::RTSPClientConnection*, char const*, char const*, char const*, char const*) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/RTSPServer.cpp<o:p></o:p></p>
<p class="MsoNormal"> #28 0x4dffc6 in RTSPServer::RTSPClientConnection::handleRequestBytes(int) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/RTSPServer.cpp:927:22<o:p></o:p></p>
<p class="MsoNormal"> #29 0x4d1e2e in GenericMediaServer::ClientConnection::incomingRequestHandler() /home/ubuntu/experiments/live555-libfuzzer/liveMedia/GenericMediaServer.cpp:291:3<o:p></o:p></p>
<p class="MsoNormal"> #30 0x4d1e2e in GenericMediaServer::ClientConnection::incomingRequestHandler(void*, int) /home/ubuntu/experiments/live555-libfuzzer/liveMedia/GenericMediaServer.cpp:284:15<o:p></o:p></p>
<p class="MsoNormal"> #31 0x645f85 in BasicTaskScheduler::SingleStep(unsigned int) /home/ubuntu/experiments/live555-libfuzzer/BasicUsageEnvironment/BasicTaskScheduler.cpp:171:2<o:p></o:p></p>
<p class="MsoNormal"> #32 0x64e4aa in BasicTaskScheduler0::doEventLoop(char volatile*) /home/ubuntu/experiments/live555-libfuzzer/BasicUsageEnvironment/BasicTaskScheduler0.cpp:80:5<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To reproduce it, please download the attachment:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Build the docker image:
<o:p></o:p></li></ol>
<p class="MsoListParagraph" style="text-indent:.5in">docker build . -t live555_bug<o:p></o:p></p>
<ol style="margin-top:0in" start="2" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Start a container on the image and open two terminals.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">In one terminal, run the live555:
<o:p></o:p></li></ol>
<p class="MsoNormal" style="margin-left:.5in;text-indent:.5in">cd live/testProgs/; ./testOnDemandRTSPServer<o:p></o:p></p>
<ol style="margin-top:0in" start="4" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">On the other terminal, run the poc:
<o:p></o:p></li></ol>
<p class="MsoListParagraph" style="margin-left:1.0in">python3 poc.py<o:p></o:p></p>
<p class="MsoNormal"> Then the testOnDemandRTSPServer aborts.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards,<o:p></o:p></p>
<p class="MsoNormal">Jinsheng Ba<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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