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The LACP responder reuses the received I/O buffer to construct the response LACP (or marker) packet. Any received padding will therefore be unintentionally included within the response. Truncate the received I/O buffer to the expected length (which is already defined in a way to allow for future protocol expansion) before reusing it to construct the response. Reported-by: Tore Anderson <tore@fud.no> Signed-off-by: Michael Brown <mcb30@ipxe.org>