lkkbd_interrupt() schedules lk->tq with schedule_work(), and the work handler lkkbd_reinit() dereferences the lkkbd structure and its serio/input_dev fields.

lkkbd_disconnect() frees the lkkbd structure without cancelling this work, so the work can run after the structure has been freed, leading to a potential use-after-free.

Cancel the pending work in lkkbd_disconnect() before unregistering and freeing the device, following the same pattern as sunkbd.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: Minseong Kim ii4gsp@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Minseong Kim ii4gsp@gmail.com --- drivers/input/keyboard/lkkbd.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/drivers/input/keyboard/lkkbd.c b/drivers/input/keyboard/lkkbd.c index c035216dd27c..72c477aab1fc 100644 --- a/drivers/input/keyboard/lkkbd.c +++ b/drivers/input/keyboard/lkkbd.c @@ -684,6 +684,8 @@ static void lkkbd_disconnect(struct serio *serio) { struct lkkbd *lk = serio_get_drvdata(serio);

+ cancel_work_sync(&lk->tq); + input_get_device(lk->dev); input_unregister_device(lk->dev); serio_close(serio);