linux-kernel - [PATCH 4.19 19/48] slip: not call free_netdev before rtnl_unlock in slip

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Message-Id: <20200319123909.159890961@linuxfoundation.org>
Date:   Thu, 19 Mar 2020 14:04:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, yangerkun <yangerkun@...wei.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 19/48] slip: not call free_netdev before rtnl_unlock in slip_open

From: yangerkun <yangerkun@...wei.com>

[ 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@...wei.com>
Reviewed-by: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.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 93f303ec17e21..5d864f8129556 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();
-- 
2.20.1