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

[Andrey Konovalov]

On Mon, Nov 6, 2017 at 10:49 AM, Oliver Neukum <oneukum@xxxxxxxx> wrote:
> Am Donnerstag, den 02.11.2017, 21:26 +0100 schrieb Andrey Konovalov:
>> When asix_suspend() is called dev->driver_priv might not have been
>> assigned a value, so we need to check that it's not NULL.
>>
>> Found by syzkaller.
>
> Hi,

Hi Oliver,

>
> 1. if that happens on suspend, it will also happen on resume

Indeed, got crashes in asix_resume() tonight as well. Mailed v2.

> 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.

Go ahead if you see a better way to fix this, my patch is more of a
hot fix trying to prevent the crashes.

Thanks!

>
>         Regards
>                 Oliver
>