netdev - Re: [PATCH] net: usb: asix: fill null-ptr-deref in asix

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Message-ID: <CAAeHK+y9GTPPjL2xTasun_e9M7jdE98DCGHWFtGF=JTPzLYOyw@mail.gmail.com>
Date:   Mon, 6 Nov 2017 17:05:59 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Oliver Neukum <oneukum@...e.com>
Cc:     allan <allan@...x.com.tw>,
        Colin Ian King <colin.king@...onical.com>,
        "David S . Miller" <davem@...emloft.net>,
        Philippe Reynes <tremyfr@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Dean Jenkins <Dean_Jenkins@...tor.com>,
        Peter Chen <peter.chen@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: usb: asix: fill null-ptr-deref in asix_suspend

On Mon, Nov 6, 2017 at 4:20 PM, Oliver Neukum <oneukum@...e.com> wrote:
> Am Montag, den 06.11.2017, 13:30 +0100 schrieb Andrey Konovalov:
>> On Mon, Nov 6, 2017 at 10:49 AM, Oliver Neukum <oneukum@...e.com> wrote:
>> >
>> >
>> > 2. Will a device work after that? The appropriate fix may be to wait
>> > until the device is properly initialized.
>>
>> This shouldn't affect real devices as far as I understand. The crash
>> can be caused by a crafted malicious device.
>
> Hi!
>
> Hm. That seems strange as driver_priv is kmalloced. Do you
> still have a descriptor that causes this?
> Shouldn't we rather reject such a broken device?

I do have a way to reproduce this.

As far as I understand, for this particular device ax88172_bind() is
called, which doesn't assign anything to dev->driver_priv, so that's
why it is NULL in suspend() and resume().

>
>         Regards
>                 Oliver
>