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

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Message-ID: <87fwhzsf26.fsf@rustcorp.com.au>
Date:	Tue, 08 Nov 2011 09:42:01 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Cc:	stable@...nel.org
Subject: Re: [PATCH] virtio-pci: fix use after free

On Mon, 7 Nov 2011 18:37:05 +0200, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> Commit 31a3ddda166cda86d2b5111e09ba4bda5239fae6 introduced
> a use after free in virtio-pci. The main issue is
> that the release method signals removal of the virtio device,
> while remove signals removal of the pci device.
> 
> For example, on driver removal or hot-unplug,
> virtio_pci_release_dev is called before virtio_pci_remove.
> We then might get a crash as virtio_pci_remove tries to use the
> device freed by virtio_pci_release_dev.
> 
> We allocate/free all resources together with the
> pci device, so we can leave the release method empty.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

Applied, thanks.  Will push once it's spent a day in linux-next.

Thanks,
Rusty.
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