Commit 411c56dc authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman

staging: gdm724x: gdm_mux: fix use-after-free on module unload

commit b58f45c8 upstream.

Make sure to deregister the USB driver before releasing the tty driver
to avoid use-after-free in the USB disconnect callback where the tty
devices are deregistered.

Fixes: 61e12104 ("staging: gdm7240: adding LTE USB driver")
Cc: Won Kang <wkang77@gmail.com>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d9f9269d
......@@ -674,14 +674,13 @@ static int __init gdm_usb_mux_init(void)
static void __exit gdm_usb_mux_exit(void)
{
unregister_lte_tty_driver();
if (mux_rx_wq) {
flush_workqueue(mux_rx_wq);
destroy_workqueue(mux_rx_wq);
}
usb_deregister(&gdm_mux_driver);
unregister_lte_tty_driver();
}
module_init(gdm_usb_mux_init);
......
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