linux-kernel - Re: [Xen-devel] [PATCH] xen: avoid NULL pointer dereference in dom0 on large machines

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Date:	Fri, 6 Mar 2015 13:18:30 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Juergen Gross <jgross@...e.com>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xensource.com>, <konrad.wilk@...cle.com>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH] xen: avoid NULL pointer dereference in dom0
 on large machines

On 26/02/15 05:52, Juergen Gross wrote:
> Using the pvops kernel a NULL pointer dereference was detected on a
> large machine (144 processors) when booting as dom0 in
> evtchn_fifo_unmask() during assignment of a pirq.
> 
> The event channel in question was the first to need a new entry in
> event_array[] in events_fifo.c. Unfortunately xen_irq_info_pirq_setup()
> is called with evtchn being 0 for a new pirq and the real event channel
> number is assigned to the pirq only during __startup_pirq().
> 
> It is mandatory to call xen_evtchn_port_setup() after assigning the
> event channel number to the pirq to make sure all memory needed for the
> event channel is allocated.

Applied to stable/for-linus-4.0 and tagged for stable, thanks.

David
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