linux-kernel - Re: [PATCH 1/7] 68328serial: check return value of copy_*_user() instead of access

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Message-ID: <20100801061230.GA2650@albatros>
Date:	Sun, 1 Aug 2010 10:12:30 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	Dan Carpenter <error27@...il.com>, kernel-janitors@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Ungerer <gerg@...inux.org>,
	Christoph Egger <siccegge@...fau.de>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] 68328serial: check return value of copy_*_user()
 instead of access_ok()

On Sat, Jul 31, 2010 at 21:09 +0200, Dan Carpenter wrote:
> On Sat, Jul 31, 2010 at 09:38:00PM +0400, Kulikov Vasiliy wrote:
> > -						sizeof(struct m68k_serial)))
> > -				return -EFAULT;
> > -			copy_to_user((struct m68k_serial *) arg,
> > +			return copy_to_user((struct m68k_serial *) arg,
> >  				    info, sizeof(struct m68k_serial));
> 
> We should return if -EFAULT copy_to_user() failes here.

Right, I was looking for this bug and made it myself :)
Thank you.

> 
> > -			return 0;
> > -			
> >  		default:
> >  			return -ENOIOCTLCMD;
> >  		}
> 
> Smatch would have caught that but I don't have a cross compile
> environment set up.
> 
> regards,
> dan carpenter
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