netdev - Re: [PATCH v2] can: bcm/raw/isotp: use per module netdevice notifier

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Date:   Tue, 15 Jun 2021 09:39:47 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-can@...r.kernel.org
Subject: Re: [PATCH v2] can: bcm/raw/isotp: use per module netdevice notifier

On 05.06.2021 19:26:35, Tetsuo Handa wrote:
> From 12c61ae3d06889c9bbc414f0230c05dc630f6409 Mon Sep 17 00:00:00 2001
> From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Date: Sat, 5 Jun 2021 19:18:21 +0900
> Subject: [PATCH v2] can: bcm/raw/isotp: use per module netdevice notifier
> 
> syzbot is reporting hung task at register_netdevice_notifier() [1] and
> unregister_netdevice_notifier() [2], for cleanup_net() might perform
> time consuming operations while CAN driver's raw/bcm/isotp modules are
> calling {register,unregister}_netdevice_notifier() on each socket.
> 
> Change raw/bcm/isotp modules to call register_netdevice_notifier() from
> module's __init function and call unregister_netdevice_notifier() from
> module's __exit function, as with gw/j1939 modules are doing.
> 
> Link: https://syzkaller.appspot.com/bug?id=391b9498827788b3cc6830226d4ff5be87107c30 [1]
> Link: https://syzkaller.appspot.com/bug?id=1724d278c83ca6e6df100a2e320c10d991cf2bce [2]
> Reported-by: syzbot <syzbot+355f8edb2ff45d5f95fa@...kaller.appspotmail.com>
> Reported-by: syzbot <syzbot+0f1827363a305f74996f@...kaller.appspotmail.com>
> Tested-by: syzbot <syzbot+355f8edb2ff45d5f95fa@...kaller.appspotmail.com>
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>

Applied to linux-can/testing.

Tnx,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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