netdev - Re: [RFC] macvlan: add tap device backend

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Message-Id: <200912141640.13562.arnd@arndb.de>
Date:	Mon, 14 Dec 2009 16:40:13 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	"" <davem@...emloft.net>, "Michael S. Tsirkin" <mst@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Or Gerlitz <ogerlitz@...taire.com>,
	"Fischer, Anna" <anna.fischer@...com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Edge Virtual Bridging <evb@...oogroups.com>
Subject: Re: [RFC] macvlan: add tap device backend

On Monday 14 December 2009, Patrick McHardy wrote:
> > +     classdev = device_create(macvtap_class, &dev->dev, devt,
> > +                              dev, "tap%d", dev->ifindex);
> > +     if (IS_ERR(classdev)) {
> > +             err = PTR_ERR(classdev);
> > +             macvtap_del_queues(dev);
> > +             macvlan_dellink(dev, NULL);
> 
> I think this may cause a double free since macvlan_dellink() will
> free the device and rtnl_newlink() will free it again on error.

Ah, right. I've changed this part a few times now, but I think introduced
the same bug again in the current version. I'll send out what I have now
if you want to take another look.

	Arnd
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