diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c
index 6f4d7ba8b1094eac73b0ea503bee81d9d976178c..babb01888b786c2e77c9d7b4844f44d31b9c7bce 100644
--- a/drivers/net/slip/slip.c
+++ b/drivers/net/slip/slip.c
@@ -863,7 +863,10 @@ static int slip_open(struct tty_struct *tty)
 	tty->disc_data = NULL;
 	clear_bit(SLF_INUSE, &sl->flags);
 	sl_free_netdev(sl->dev);
+	/* do not call free_netdev before rtnl_unlock */
+	rtnl_unlock();
 	free_netdev(sl->dev);
+	return err;
 
 err_exit:
 	rtnl_unlock();