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

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Message-ID: <1457131342.8935.2.camel@suse.de>
Date:	Fri, 04 Mar 2016 23:42:22 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	Andrey Konovalov <andreyknvl@...il.com>
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, 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?

	Regards
		Oliver