4.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold <johan@xxxxxxxxxx> commit 1e948479b3d63e3ac0ecca13cbf4921c7d17c168 upstream. Make sure to deregister the SPI driver before releasing the tty driver to avoid use-after-free in the SPI remove callback where the tty devices are deregistered. Fixes: 72d4724ea54c ("serial: ifx6x60: Add modem power off function in the platform reboot process") Cc: Jun Chen <jun.d.chen@xxxxxxxxx> Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/tty/serial/ifx6x60.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/tty/serial/ifx6x60.c +++ b/drivers/tty/serial/ifx6x60.c @@ -1382,9 +1382,9 @@ static struct spi_driver ifx_spi_driver static void __exit ifx_spi_exit(void) { /* unregister */ + spi_unregister_driver(&ifx_spi_driver); tty_unregister_driver(tty_drv); put_tty_driver(tty_drv); - spi_unregister_driver(&ifx_spi_driver); unregister_reboot_notifier(&ifx_modem_reboot_notifier_block); }