Re: [Xen-devel] [PATCH v2 1/1] xen/blkback: rework connect_ring() to avoid inconsistent xenstore 'ring-page-order' set by malicious blkfront

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Tue, Dec 18, 2018 at 10:33:00AM +0100, Roger Pau Monné wrote:
> On Tue, Dec 18, 2018 at 08:55:38AM +0800, Dongli Zhang wrote:
> > +   for (i = 0; i < nr_grefs; i++) {
> > +           char ring_ref_name[RINGREF_NAME_LEN];
> > +
> > +           snprintf(ring_ref_name, RINGREF_NAME_LEN, "ring-ref%u", i);
> > +           err = xenbus_scanf(XBT_NIL, dir, ring_ref_name,
> > +                              "%u", &ring_ref[i]);
> > +
> > +           if (err != 1 && (i || (!i && nr_grefs > 1))) {
> 
> AFAICT the above condition can be simplified as "err != 1 &&
> nr_grefs".

Sorry, this should be "err != 1 && nr_grefs > 1", since it's not order
but rather the number of grefs.

Roger.

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