On 21.06.2021 13:58:20, Marc Kleine-Budde wrote:
> From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
>
> commit 8d0caedb759683041d9db82069937525999ada53 upstream
>
> 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]
> Link: https://lore.kernel.org/r/54a5f451-05ed-f977-8534-79e7aa2bcc8f@xxxxxxxxxxxxxxxxxxx
> Cc: linux-stable <stable@xxxxxxxxxxxxxxx>
> Reported-by: syzbot <syzbot+355f8edb2ff45d5f95fa@xxxxxxxxxxxxxxxxxxxxxxxxx>
> Reported-by: syzbot <syzbot+0f1827363a305f74996f@xxxxxxxxxxxxxxxxxxxxxxxxx>
> Reviewed-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
> Tested-by: syzbot <syzbot+355f8edb2ff45d5f95fa@xxxxxxxxxxxxxxxxxxxxxxxxx>
> Tested-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
> Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> [mkl: ported to v4.9.273]
> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> ---
> Hello Greg,
>
> this is a backport of
>
> | 8d0caedb7596 can: bcm/raw/isotp: use per module netdevice notifier
>
> to v4.9.273. Please apply.
This also applies to v4.4.273.
Marc
--
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