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USB: serial: keyspan_pda: fix tx-unthrottle use-after-free

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commit 49fbb8e37a961396a5b6c82937c70df91de45e9d upstream.

The driver's transmit-unthrottle work was never flushed on disconnect,
something which could lead to the driver port data being freed while the
unthrottle work is still scheduled.

Fix this by cancelling the unthrottle work when shutting down the port.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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>
This commit is contained in:
Johan Hovold 2020-10-25 18:45:51 +01:00 committed by Greg Kroah-Hartman
parent df2754ae5f
commit 28a9c26838
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/serial/keyspan_pda.c
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@ -647,8 +647,12 @@ static int keyspan_pda_open(struct tty_struct *tty,
}
static void keyspan_pda_close(struct usb_serial_port *port)
{
struct keyspan_pda_private *priv = usb_get_serial_port_data(port);
usb_kill_urb(port->write_urb);
usb_kill_urb(port->interrupt_in_urb);
cancel_work_sync(&priv->unthrottle_work);
}