Improved stability with incorrect Bulk data

Days Gone has some textures with bulk data at the end of uasset file, however data itself is nearly empty. Discarding such bunk data instead of crashing with serializing after the end of file.

Author: gildor2

Unreal/UnCoreSerialize.cpp

@@ -1234,7 +1234,7 @@ void FByteBulkData::Serialize(FArchive &Ar)
 
 	SerializeHeader(Ar);
 
-	if (BulkDataFlags & BULKDATA_Unused)	// skip serializing
+	if (BulkDataFlags & BULKDATA_Unused || ElementCount == 0)	// skip serializing
 	{
 #if DEBUG_BULK
 		appPrintf("bulk with no data\n");
@@ -1258,6 +1258,13 @@ void FByteBulkData::Serialize(FArchive &Ar)
 		}
 		if (BulkDataFlags & BULKDATA_PayloadAtEndOfFile)
 		{
+			if (BulkDataOffsetInFile + 16 >= Ar.GetFileSize64())
+			{
+				appNotify("Bulk position is outside of the file (%d bytes)", BulkDataSizeOnDisk);
+				// Prevent any possible use of this bulk
+				BulkDataFlags |= BULKDATA_Unused;
+				return;
+			}
 			// stored in the same file, but at different position
 			// save archive position
 			int savePos, saveStopper;