From: Lino Sanfilippo Date: Sun, 10 Jul 2022 16:44:39 +0000 (+0200) Subject: serial: core: sanitize RS485 delays read from device tree X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4dfd10351e49a767f145fb0f6bf7f408f54ab94b;p=linux.git serial: core: sanitize RS485 delays read from device tree Currently the RTS delays set via device tree are not clamped to a maximum value although the device tree bindings documentation for RS485 claims that only a maximum of 1000 msecs is allowed. So clamp the values to avoid arbitrary high delay settings. However clamp the values to 100 instead of 1000 msecs to be consistent which the maximum that is allowed when setting the delays from userspace via the UART ioctl TIOCSRS485. Signed-off-by: Lino Sanfilippo Link: https://lore.kernel.org/r/20220710164442.2958979-6-LinoSanfilippo@gmx.de Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 3158f05a328ce..ac198d0d4c807 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -3395,6 +3395,8 @@ int uart_get_rs485_mode(struct uart_port *port) rs485conf->delay_rts_after_send = 0; } + uart_sanitize_serial_rs485_delays(port, rs485conf); + /* * Clear full-duplex and enabled flags, set RTS polarity to active high * to get to a defined state with the following properties: