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wanxl: fix info leak in ioctl
The wanxl_ioctl() code fails to initialize the two padding bytes of struct sync_serial_settings after the ->loopback member. Add an explicit memset(0) before filling the structure to avoid the info leak. Signed-off-by: Salva Peiró <speiro@ai2.upv.es> Signed-off-by: David S. Miller <davem@davemloft.net>
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