[SLOW-FUZZING] Seg fault on RTPIncomingSourceGroup::GetSource

[murillo128]

==4269==ERROR: AddressSanitizer: heap-use-after-free on address 0x61c000045900 at pc 0x7f823d5457bc bp 0x7f823d14a250 sp 0x7f823d14a240
READ of size 4 at 0x61c000045900 thread T6
    #0 0x7f823d5457bb in RTPIncomingSourceGroup::GetSource(unsigned int) ../media-server/src/rtp/RTPIncomingSourceGroup.cpp:28
    #1 0x7f823d43c288 in DTLSICETransport::GetIncomingSource(unsigned int) ../media-server/src/DTLSICETransport.cpp:2296
    #2 0x7f823d448820 in DTLSICETransport::onRTCP(std::shared_ptr<RTCPCompoundPacket> const&) ../media-server/src/DTLSICETransport.cpp:1985
    #3 0x7f823d46000c in DTLSICETransport::onData(ICERemoteCandidate const*, unsigned char*, unsigned int) ../media-server/src/DTLSICETransport.cpp:134
    #4 0x7f823d42cc93 in ICERemoteCandidate::onData(unsigned char*, unsigned int) ../media-server/include/ICERemoteCandidate.h:52
    #5 0x7f823d42cc93 in RTPBundleTransport::Read() ../media-server/src/RTPBundleTransport.cpp:533
    #6 0x7f823d42ed17 in RTPBundleTransport::Run() ../media-server/src/RTPBundleTransport.cpp:680
    #7 0x7f823d42eebc in RTPBundleTransport::run(void*) ../media-server/src/RTPBundleTransport.cpp:644
    #8 0x7f8242d707fb in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x77fb)
    #9 0x7f8242a9db5e in clone (/lib/x86_64-linux-gnu/libc.so.6+0x114b5e)

0x61c000045900 is located 128 bytes inside of 1792-byte region [0x61c000045880,0x61c000045f80)
freed by thread T0 here:
    #0 0x7f8243d682d0 in operator delete(void*) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe12d0)
    #1 0x7f823d3149fa in _wrap_delete_RTPIncomingSourceGroup ../src/media-server_wrap.cxx:10464
    #2 0xe7a01d in v8::internal::GlobalHandles::DispatchPendingPhantomCallbacks(bool) (/root/.nvm/versions/node/v8.8.1/bin/node+0xe7a01d)
    #3 0xe7a289 in v8::internal::GlobalHandles::PostGarbageCollectionProcessing(v8::internal::GarbageCollector, v8::GCCallbackFlags) (/root/.nvm/versions/node/v8.8.1/bin/node+0xe7a289)
    #4 0xea544d in v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) (/root/.nvm/versions/node/v8.8.1/bin/node+0xea544d)
    #5 0xea6220 in v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) (/root/.nvm/versions/node/v8.8.1/bin/node+0xea6220)
    #6 0xe508c5 in v8::internal::Factory::NewRawOneByteString(int, v8::internal::PretenureFlag) (/root/.nvm/versions/node/v8.8.1/bin/node+0xe508c5)
    #7 0xf55aff in v8::internal::Handle<v8::internal::String> v8::internal::JsonParser<true>::ScanJsonString<false>() (/root/.nvm/versions/node/v8.8.1/bin/node+0xf55aff)
    #8 0xf56d87 in v8::internal::JsonParser<true>::ParseJsonValue() (/root/.nvm/versions/node/v8.8.1/bin/node+0xf56d87)
    #9 0xf56170 in v8::internal::JsonParser<true>::ParseJsonObject() (/root/.nvm/versions/node/v8.8.1/bin/node+0xf56170)
    #10 0xf56d97 in v8::internal::JsonParser<true>::ParseJsonValue() (/root/.nvm/versions/node/v8.8.1/bin/node+0xf56d97)
    #11 0xf57314 in v8::internal::JsonParser<true>::ParseJson() (/root/.nvm/versions/node/v8.8.1/bin/node+0xf57314)
    #12 0xbb30db in v8::internal::Builtin_JsonParse(int, v8::internal::Object**, v8::internal::Isolate*) (/root/.nvm/versions/node/v8.8.1/bin/node+0xbb30db)