ieee802154: atusb: fix use-after-free at disconnect

commit 7fd25e6 upstream.

The disconnect callback was accessing the hardware-descriptor private
data after having having freed it.

Fixes: 7490b00 ("ieee802154: add support for atusb transceiver")
Cc: stable <[email protected]>     # 4.2
Cc: Alexander Aring <[email protected]>
Reported-by: [email protected]
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Stefan Schmidt <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: jhovold

drivers/net/ieee802154/atusb.c

@@ -838,10 +838,11 @@ static void atusb_disconnect(struct usb_interface *interface)
 
 	ieee802154_unregister_hw(atusb->hw);
 
+	usb_put_dev(atusb->usb_dev);
+
 	ieee802154_free_hw(atusb->hw);
 
 	usb_set_intfdata(interface, NULL);
-	usb_put_dev(atusb->usb_dev);
 
 	pr_debug("atusb_disconnect done\n");
 }