Re: [PATCH net] vhost/net: fix heads usage of ubuf_info

From: Michael S. Tsirkin
Date: Sun Mar 17 2013 - 14:50:01 EST

On Sun, Mar 17, 2013 at 02:29:55PM -0400, David Miller wrote:
> From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
> Date: Sun, 17 Mar 2013 14:46:09 +0200
> > ubuf info allocator uses guest controlled head as an index,
> > so a malicious guest could put the same head entry in the ring twice,
> > and we will get two callbacks on the same value.
> > To fix use upend_idx which is guaranteed to be unique.
> >
> > Reported-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
> > Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Applied and queued up for -stable, thanks.

OK I'll drop it from my tree then.
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