Language: Java
Label: vulnerable
CWE: CWE-502 \u2014 Deserialization of Untrusted Data
The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

Code:
	public void writeData(LPDataOutput output) throws IOException {
		output.writeInt(slotId);
		output.writeItemIdentifierStack(ItemIdentifierStack.getFromStack(stack));
		output.writeInt(button);
	}