linux-kernel - Re: [patch 1/2] ptp: return -EFAULT on copy_to

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Date:	Wed, 1 Jun 2011 12:16:42 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Dan Carpenter <error27@...il.com>,
	Richard Cochran <richard.cochran@...cron.at>,
	"David S. Miller" <davem@...emloft.net>,
	Arnd Bergmann <arnd@...db.de>,
	open list <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 1/2] ptp: return -EFAULT on copy_to_user() errors

On Tue, May 31, 2011 at 11:46:20PM -0700, John Stultz wrote:
> On Mon, 2011-05-30 at 08:12 +0200, Richard Cochran wrote:
> > On Sun, May 29, 2011 at 10:53:12PM +0300, Dan Carpenter wrote:
> > > copy_to_user() returns the number of bytes remaining, but we want a
> > > negative error code here.
> > > 
> > > Signed-off-by: Dan Carpenter <error27@...il.com>
> > > 
> > > diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
> > > index a8d03ae..93fa22d 100644
> > > --- a/drivers/ptp/ptp_chardev.c
> > > +++ b/drivers/ptp/ptp_chardev.c
> > > @@ -46,7 +46,8 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
> > >  		caps.n_ext_ts = ptp->info->n_ext_ts;
> > >  		caps.n_per_out = ptp->info->n_per_out;
> > >  		caps.pps = ptp->info->pps;
> > > -		err = copy_to_user((void __user *)arg, &caps, sizeof(caps));
> > > +		if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
> > > +			err = -EFAULT;
> > 
> > Yes, right, and thanks for the extra review.
> > 
> > Thomas, can you please queue these two patches for 3.0-rc2?
> > 
> > (Or should John Stultz handle this sort of thing?)
> 
> Queued in my tree.
> 
> Richard, Since you like these, do you mind formally acking them so I can
> add that?

Acked-by: Richard Cochran <richard.cochran@...cron.at>
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