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 Signed-off-by: Johan Hovold johan@kernel.org --- drivers/usb/serial/ti_usb_3410_5052.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c index 4b497c1e850b..bb50098a0ce6 100644 --- 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 *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; }