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Potentially abusable crash #223

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@AudriusButkevicius

Was doing some packet safety analysis with the robot, and I think this bit is not guarded against DoS abuse:

https://github.com/ThePhrozenKeep/D2MOO/blob/master/source/D2Game/src/ITEMS/ItemMode.cpp#L4774

I couldn't easily find something that would prevent people crashing the game by doing sending a packet that places tp scroll to identify book.
However, I didn't try to exploit it in game either, so was wondering if vanilla has the same issue too.
Modern version of the game has a guard around it.

Worth someone (who has good RE setup for the game) having a look whether there is anything that was missed in reimplementation.

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