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

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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: 61e121047645 ("staging: gdm7240: adding LTE USB driver")
Cc: stable <stable@vger.kernel.org>     # 3.12
Cc: Won Kang <wkang77@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-04-26 12:23:04 +02:00 committed by Greg Kroah-Hartman
parent ea82fc151c
commit b58f45c8fc
1 changed files with 1 additions and 2 deletions
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3
drivers/staging/gdm724x/gdm_mux.c
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@ -664,9 +664,8 @@ static int __init gdm_usb_mux_init(void)
static void __exit gdm_usb_mux_exit(void)
{
unregister_lte_tty_driver();
usb_deregister(&gdm_mux_driver);
unregister_lte_tty_driver();
}
module_init(gdm_usb_mux_init);