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USB: f81232: fix device initialisation at open

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Do not use uninitialised termios data to determine when to configure the
device at open.

This also prevents stack data from leaking to userspace.

Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-06-10 18:29:37 +02:00 committed by Greg Kroah-Hartman
parent 317ddd256b
commit 21886725d5
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/serial/f81232.c
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@ -165,11 +165,12 @@ static void f81232_set_termios(struct tty_struct *tty,
/* FIXME - Stubbed out for now */
/* Don't change anything if nothing has changed */
if (!tty_termios_hw_change(&tty->termios, old_termios))
if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
return;
/* Do the real work here... */
tty_termios_copy_hw(&tty->termios, old_termios);
if (old_termios)
tty_termios_copy_hw(&tty->termios, old_termios);
}
static int f81232_tiocmget(struct tty_struct *tty)
@ -187,12 +188,11 @@ static int f81232_tiocmset(struct tty_struct *tty,
static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct ktermios tmp_termios;
int result;
/* Setup termios */
if (tty)
f81232_set_termios(tty, port, &tmp_termios);
f81232_set_termios(tty, port, NULL);
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (result) {