netdev - Re: [patch 1/2] vhost: potential integer overflows

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Date:	Tue, 12 Oct 2010 16:51:20 +0200
From:	Dan Carpenter <error27@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Juan Quintela <quintela@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Rusty Russell <rusty@...tcorp.com.au>, kvm@...r.kernel.org,
	virtualization@...ts.osdl.org, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch 1/2] vhost: potential integer overflows

On Tue, Oct 12, 2010 at 02:25:48PM +0200, Michael S. Tsirkin wrote:
> 
> As far as I can see, maximum value for num is 64K - 1:
> 
>                 if (!s.num || s.num > 0xffff || (s.num & (s.num - 1))) {
>                         r = -EINVAL;
>                         break;
>                 }
> 
> How can any of the above two trigger?
> It seems easier to check value for sanity at a single place where it's
> passed from userspace to kernel.
> 

Gar.  Sorry for that.  My mistake.

regards,
dan carpenter

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