Re: [Xen-devel] [PATCH] x86: fix an off-by-one pirq range check

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Jul 01, 2010 at 08:27:23AM +0100, Jan Beulich wrote:
> >>> On 30.06.10 at 18:16, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
> >>> wrote:
> > On Wed, Jun 30, 2010 at 07:37:26AM +0100, Jan Beulich wrote:
> >> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
> > 
> > Won't that make PV guest with only one IRQ passed through unable to ACK it?
> > (and if the IRQ is not shared that is).
> 
> Why would you think so? In such a case, nr_pirqs would be 1, and the
> only permitted pirq would be 0. All other places do the range checks
> correctly, just this one would let through an out of bounds number.

Excellent. Thanks for the answer. 

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