Commit 69ef9bc5 authored by Miguel Ojeda's avatar Miguel Ojeda

auxdisplay: ht16k33: fix potential user-after-free on module unload

On module unload/remove, we need to ensure that work does not run
after we have freed resources. Concretely, cancel_delayed_work()
may return while the callback function is still running.

From kernel/workqueue.c:

    The work callback function may still be running on return,
    unless it returns true and the work doesn't re-arm itself.
    Explicitly flush or use cancel_delayed_work_sync() to wait on it.

Link: https://lore.kernel.org/lkml/20190204220952.30761-1-TheSven73@googlemail.com/Reported-by: default avatarSven Van Asbroeck <thesven73@gmail.com>
Reviewed-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: default avatarSven Van Asbroeck <TheSven73@gmail.com>
Acked-by: default avatarRobin van der Gracht <robin@protonic.nl>
Signed-off-by: default avatarMiguel Ojeda <miguel.ojeda.sandonis@gmail.com>
parent 8834f560
...@@ -509,7 +509,7 @@ static int ht16k33_remove(struct i2c_client *client) ...@@ -509,7 +509,7 @@ static int ht16k33_remove(struct i2c_client *client)
struct ht16k33_priv *priv = i2c_get_clientdata(client); struct ht16k33_priv *priv = i2c_get_clientdata(client);
struct ht16k33_fbdev *fbdev = &priv->fbdev; struct ht16k33_fbdev *fbdev = &priv->fbdev;
cancel_delayed_work(&fbdev->work); cancel_delayed_work_sync(&fbdev->work);
unregister_framebuffer(fbdev->info); unregister_framebuffer(fbdev->info);
framebuffer_release(fbdev->info); framebuffer_release(fbdev->info);
free_page((unsigned long) fbdev->buffer); free_page((unsigned long) fbdev->buffer);
......
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