From: Johan Hovold <johan@xxxxxxxxxx> commit b91cfb2573aeb5ab426fc3c35bcfe9e0d2a7ecbc upstream. Changing the port type and closing_wait parameter are privileged operations so make sure to return -EPERM if a regular user tries to change them. Note that the closing_wait parameter would not actually have been changed but the return value did not indicate that. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210407102334.32361-15-johan@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/tty/mxser.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/tty/mxser.c +++ b/drivers/tty/mxser.c @@ -1270,6 +1270,7 @@ static int mxser_set_serial_info(struct if (!capable(CAP_SYS_ADMIN)) { if ((ss->baud_base != info->baud_base) || (close_delay != info->port.close_delay) || + (closing_wait != info->port.closing_wait) || ((ss->flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK))) { mutex_unlock(&port->mutex); return -EPERM; @@ -1296,11 +1297,11 @@ static int mxser_set_serial_info(struct baud = ss->baud_base / ss->custom_divisor; tty_encode_baud_rate(tty, baud, baud); } - } - info->type = ss->type; + info->type = ss->type; - process_txrx_fifo(info); + process_txrx_fifo(info); + } if (tty_port_initialized(port)) { if (flags != (port->flags & ASYNC_SPD_MASK)) {
