linux-kernel - Re: [PATCH] virtio_net: fix use after free

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Message-ID: <20141017092011.GA31313@redhat.com>
Date:	Fri, 17 Oct 2014 12:20:11 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	jasowang@...hat.com
Subject: Re: [PATCH] virtio_net: fix use after free

On Wed, Oct 15, 2014 at 04:47:27PM -0400, David Miller wrote:
> From: "Michael S. Tsirkin" <mst@...hat.com>
> Date: Wed, 15 Oct 2014 16:23:28 +0300
> 
> > You used __netif_subqueue_stopped but that seems to use
> > a slightly more expensive test_bit internally.
> 
> More expensive in what sense?  It should be roughly the same
> as "x & y" sans the volatile.

I really just meant volatile - this might prevent some compiler
optimizations. I have't actually checked the produced binary so
I don't know for sure.

> Anyways I'm ambivalent and I want to see this bug fixes, so I'll
> apply your patch.
> 
> Thanks!
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