Unreal Engine Issues

UE-72984

Crash due to LAN beacon packet incompatibility in 4.22

Crash due to LAN beacon packet incompatibility in 4.22

UDN
Description

We changed the IP address serialization format without bumping the LAN beacon packet version. Should just need to bump it up.

Steps to Reproduce
  1. Create a project in 4.21
  2. Call node CreateSession with Lan option and numbers of players set.
  3. Call OpenLevel node with listen option
  4. Create a project in 4.22
  5. Call node FindSession with Lan option
Callstack
Unhandled exception

UE4Editor_OnlineSubsystemNull!operator>>() [d:\build\++ue4\sync\engine\plugins\online\onlinesubsystem\source\public\nboserializer.h:817]
UE4Editor_OnlineSubsystemNull!FOnlineSessionNull::ReadSessionFromPacket() [d:\build\++ue4\sync\engine\plugins\online\onlinesubsystemnull\source\private\onlinesessioninterfacenull.cpp:1085]
UE4Editor_OnlineSubsystemNull!FOnlineSessionNull::OnValidResponsePacketReceived() [d:\build\++ue4\sync\engine\plugins\online\onlinesubsystemnull\source\private\onlinesessioninterfacenull.cpp:1180]
UE4Editor_OnlineSubsystemNull!TBaseRawMethodDelegateInstance<0,FOnlineSessionNull,void __cdecl(unsigned char *,int)>::ExecuteIfSafe() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:518]
UE4Editor_OnlineSubsystem!FLANSession::TriggerOnValidResponsePacketDelegates() [d:\build\++ue4\sync\engine\plugins\online\onlinesubsystem\source\public\lanbeacon.h:231]
UE4Editor_OnlineSubsystem!FLANSession::Tick() [d:\build\++ue4\sync\engine\plugins\online\onlinesubsystem\source\private\lanbeacon.cpp:246]
UE4Editor_OnlineSubsystemNull!FOnlineSessionNull::Tick() [d:\build\++ue4\sync\engine\plugins\online\onlinesubsystemnull\source\private\onlinesessioninterfacenull.cpp:961]
UE4Editor_OnlineSubsystemNull!FOnlineSubsystemNull::Tick() [d:\build\++ue4\sync\engine\plugins\online\onlinesubsystemnull\source\private\onlinesubsystemnull.cpp:174]
UE4Editor_Core!FTicker::Tick() [d:\build\++ue4\sync\engine\source\runtime\core\private\containers\ticker.cpp:95]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:4167]
UE4Editor!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:168]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
UE4Editor!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:275]
UE4Editor!__scrt_common_main_seh() [d:\agent\_work\3\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Fixed
ComponentUE - Networking
Affects Versions4.22
Target Fix4.22.1
Fix Commit5958967
Main Commit5958968
CreatedApr 17, 2019
ResolvedApr 17, 2019
UpdatedApr 23, 2019
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