netdev - Re: [PATCH] can: remove WARN() statement from list operation sanity check

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Date:   Fri, 27 Nov 2020 08:28:44 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Oliver Hartkopp <socketcan@...tkopp.net>, dvyukov@...gle.com,
        netdev@...r.kernel.org, linux-can@...r.kernel.org
Cc:     syzkaller-bugs@...glegroups.com,
        syzbot+381d06e0c8eaacb8706f@...kaller.appspotmail.com,
        syzbot+d0ddd88c9a7432f041e6@...kaller.appspotmail.com,
        syzbot+76d62d3b8162883c7d11@...kaller.appspotmail.com
Subject: Re: [PATCH] can: remove WARN() statement from list operation sanity
 check

On 11/26/20 8:21 PM, Oliver Hartkopp wrote:
> To detect potential bugs in CAN protocol implementations (double removal
> of receiver entries) a WARN() statement has been used if no matching list
> item was found for removal.
> 
> The fault injection issued by syzkaller was able to create a situation
> where the closing of a socket runs simultaneously to the notifier call
> chain for removing the CAN network device in use.
> 
> This case is very unlikely in real life but it doesn't break anything.
> Therefore we just replace the WARN() statement with pr_warn() to
> preserve the notification for the CAN protocol development.
> 
> Reported-by: syzbot+381d06e0c8eaacb8706f@...kaller.appspotmail.com
> Reported-by: syzbot+d0ddd88c9a7432f041e6@...kaller.appspotmail.com
> Reported-by: syzbot+76d62d3b8162883c7d11@...kaller.appspotmail.com
> Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>

applied to 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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