netdev - Re: Possible double-free in the usbnet driver

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Date:	Sat, 5 Mar 2016 02:00:29 +0300
From:	Andrey Konovalov <andreyknvl@...il.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: Possible double-free in the usbnet driver

On Sat, Mar 5, 2016 at 1:42 AM, Oliver Neukum <oneukum@...e.de> wrote:
> On Sat, 2016-03-05 at 01:26 +0300, Andrey Konovalov wrote:
>> and when I run the vm and connect the device I get:
>>
>> [   23.672662] cdc_ncm 1-1:1.6: bind() failure
>> [   23.673447] usbnet_probe(): freeing netdev: ffff88006ab48000
>> [   23.675822] usbnet_probe(): freeing netdev: ffff88006ab48000
>>
>> So this seems to be a double-free (or at least a double free_netdev()
>> call), but the object gets freed twice from usbnet_probe() and not
>> from usbnet_disconnect(), so you're right that the latter doesn't get
>> called. I'm not sure how usbnet_probe() ends up being called twice.
>
> Do you have lsusb?

You mean inside the vm?
I do.

>
>         Regards
>                 Oliver
>
>