From: Johan Hovold johan@kernel.org
commit d370c90dcd64e427a79a093a070117a1571d4cd8 upstream.
Changing the port closing-wait parameter is a privileged operation so make sure to return -EPERM if a regular user tries to change it.
Cc: stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/serial/ti_usb_3410_5052.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/usb/serial/ti_usb_3410_5052.c +++ b/drivers/usb/serial/ti_usb_3410_5052.c @@ -1418,14 +1418,19 @@ static int ti_set_serial_info(struct tty struct serial_struct *ss) { struct usb_serial_port *port = tty->driver_data; - struct ti_port *tport = usb_get_serial_port_data(port); + struct tty_port *tport = &port->port; unsigned cwait;
cwait = ss->closing_wait; if (cwait != ASYNC_CLOSING_WAIT_NONE) cwait = msecs_to_jiffies(10 * ss->closing_wait);
- tport->tp_port->port.closing_wait = cwait; + if (!capable(CAP_SYS_ADMIN)) { + if (cwait != tport->closing_wait) + return -EPERM; + } + + tport->closing_wait = cwait;
return 0; }