can: usb_8dev: fix use-after-free on disconnect

The driver was accessing its driver data after having freed it.

Fixes: 0024d8ad1639 ("can: usb_8dev: Add support for USB2CAN interface from 8 devices")
Cc: stable <stable@vger.kernel.org>     # 3.9
Cc: Bernd Krumboeck <b.krumboeck@gmail.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index d596a2ad7f78bca8689dcbe3244c755ba5a1c8d1..8fa224b28218b262f132106203f2c0279c94d213 100644 (file)
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -996,9 +996,8 @@ static void usb_8dev_disconnect(struct usb_interface *intf)
                netdev_info(priv->netdev, "device disconnected\n");
 
                unregister_netdev(priv->netdev);
-               free_candev(priv->netdev);
-
                unlink_all_urbs(priv);
+               free_candev(priv->netdev);
        }
 
 }