linux-kernel - Re: [Xen-devel] [PATCH 4/9] xen/events: BUG() when we can't allocate our event->irq array.

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Date:	Fri, 30 Sep 2011 08:55:53 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Dan Carpenter <error27@...il.com>
Subject: Re: [Xen-devel] [PATCH 4/9] xen/events: BUG() when we can't
 allocate our event->irq array.

On Thu, 2011-09-29 at 20:52 +0100, Konrad Rzeszutek Wilk wrote:
> In case we can't allocate we are doomed. We should BUG_ON
> instead of trying to dereference it later on.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
>  drivers/xen/events.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> index 7523719..5db04bf 100644
> --- a/drivers/xen/events.c
> +++ b/drivers/xen/events.c
> @@ -1670,6 +1670,8 @@ void __init xen_init_IRQ(void)
>  
>  	evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
>  				    GFP_KERNEL);
> +	if (!evtchn_to_irq)
> +		BUG();

AKA
	BUG_ON(!evtchn_to_irq);

but

Acked-by: Ian Campbell <ian.campbell@...rix.com>


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