netdev - Re: KASAN: use-after-free Read in cfusbl_device

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Message-ID: <YrVYywPFYiqWJo4a@archdragon>
Date:   Fri, 24 Jun 2022 15:25:15 +0900
From:   "Dae R. Jeong" <threeearcat@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: KASAN: use-after-free Read in cfusbl_device_notify

On Fri, Jun 24, 2022 at 08:15:54AM +0200, Eric Dumazet wrote:
> On Fri, Jun 24, 2022 at 8:08 AM Dae R. Jeong <threeearcat@...il.com> wrote:
> >
> > Hello,
> >
> > We observed a crash "KASAN: use-after-free Read in cfusbl_device_notify" during fuzzing.
> 
> This is a known problem.
> 
> Some drivers do not like NETDEV_UNREGISTER being delivered multiple times.
>
> Make sure in your fuzzing to have NET_DEV_REFCNT_TRACKER=y
> 
> Thanks.

Our config already have CONFIG_NET_DEV_REFCNT_TRACKER=y.
Anyway, this UAF report seems not interesting.

Thank you for your quick reply.


Best regards,
Dae R. Jeong.