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UBLK_IO_UNREGISTER_IO_BUF currently requires a valid q_id and tag to be passed in the ublksrv_io_cmd. However, only the addr (registered buffer index) is actually used to unregister the buffer. There is no check that the q_id and tag are for the ublk request whose buffer is registered at the given index. To prepare to allow userspace to omit the q_id and tag, check the UBLK_F_SUPPORT_ZERO_COPY flag on the ublk_device instead of the ublk_queue. Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250620151008.3976463-9-csander@purestorage.com Signed-off-by: Jens Axboe <axboe@kernel.dk>