From 4d6ee3123d65743b7110b8def64f8015b2adbebb Mon Sep 17 00:00:00 2001
From: yangerkun <yangerkun@huawei.com>
Date: Wed, 26 Feb 2020 11:54:35 +0800
Subject: [PATCH] slip: not call free_netdev before rtnl_unlock in slip_open

[ Upstream commit f596c87005f7b1baeb7d62d9a9e25d68c3dfae10 ]

As the description before netdev_run_todo, we cannot call free_netdev
before rtnl_unlock, fix it by reorder the code.

Signed-off-by: yangerkun <yangerkun@huawei.com>
Reviewed-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/slip/slip.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c
index 61d7e0d1d77d..8e56a41dd758 100644
--- a/drivers/net/slip/slip.c
+++ b/drivers/net/slip/slip.c
@@ -863,7 +863,10 @@ err_free_chan:
 	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();