linux-kernel - [PATCH 3.16 03/61] slcan: not call free_netdev before rtnl_unlock in slcan

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Message-ID: <lsq.1591725832.366879170@decadent.org.uk>
Date:   Tue, 09 Jun 2020 19:03:54 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Oliver Hartkopp" <socketcan@...tkopp.net>,
        "yangerkun" <yangerkun@...wei.com>
Subject: [PATCH 3.16 03/61] slcan: not call free_netdev before rtnl_unlock
 in slcan_open

3.16.85-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Oliver Hartkopp <socketcan@...tkopp.net>

commit 2091a3d42b4f339eaeed11228e0cbe9d4f92f558 upstream.

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

This patch is a 1:1 copy of upstream slip.c commit f596c87005f7
("slip: not call free_netdev before rtnl_unlock in slip_open").

Reported-by: yangerkun <yangerkun@...wei.com>
Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/can/slcan.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -620,7 +620,10 @@ err_free_chan:
 	sl->tty = NULL;
 	tty->disc_data = NULL;
 	clear_bit(SLF_INUSE, &sl->flags);
+	/* do not call free_netdev before rtnl_unlock */
+	rtnl_unlock();
 	slc_free_netdev(sl->dev);
+	return err;
 
 err_exit:
 	rtnl_unlock();