FObjectReferenceCache::ResolveObjectReferenceHandleInternal can return objects marked for garbage- is that expected?

Development Programming & Scripting
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1

Hi again Iris friends!

In debugging some export issues, I’ve noticed that FObjectReferenceCache::ResolveObjectReferenceHandleInternal makes a call to FindObjectFast that doesn’t seem to prevent RF_Garbage marked objects from being found. This can lead to replicated properties or RPC params being resolved to objects that do not pass the IsValid test. This seems a bit suspicious given that if an object is fully unloaded, FObjectReferenceCache::ResolveObjectReferenceHandleInternal can result in async loading it- thus I would expect to get a fresh, non-garbage version of an object that can be counted on to pass IsValid. Is this expected? Am I just thinking about things wrong? Or should the function be changed to only return objects that are valid?

Thanks very much!

Josh

2

Hi,

Thanks for reporting the issue. This issue is also present with FNetGUIDCache. It does seem a bit scary to return a valid pointer to an invalid object as it requires everybody to always check even raw pointers for validity in their RPCs for example. I’ve created an issue UE-309528 for this.

Cheers,

Peter

3

Thanks!