linux-kernel - Re: [PATCH 02/04] s390: bus_id -> dev_set

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Date:	Thu, 3 Jul 2008 04:18:42 +0400
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	linux390@...ibm.com, Kay Sievers <kay.sievers@...y.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/04] s390: bus_id -> dev_set_name() changes

On Wed, Jul 02, 2008 at 04:07:42PM -0700, Greg KH wrote:
> On Thu, Jul 03, 2008 at 02:14:01AM +0400, Anton Vorontsov wrote:
> > On Wed, Jul 02, 2008 at 08:48:11AM -0700, Greg KH wrote:
> > > From: Cornelia Huck <cornelia.huck@...ibm.com>
> > > 
> > > Convert most s390 users setting bus_id to dev_set_name().
> > > css and ccw busses are deferred since they need some special
> > > treatment.
> > > 
> > > Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
> > > Cc: Kay Sievers <kay.sievers@...y.org>
> > > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> > > 
> > > ---
> > >  drivers/s390/block/dcssblk.c |    2 +-
> > >  drivers/s390/char/vmlogrdr.c |    3 +--
> > >  drivers/s390/cio/ccwgroup.c  |    3 +--
> > >  drivers/s390/cio/chp.c       |    3 +--
> > >  drivers/s390/cio/css.c       |    4 ++--
> > >  drivers/s390/crypto/ap_bus.c |    4 ++--
> > >  drivers/s390/net/netiucv.c   |    2 +-
> > >  drivers/s390/s390_rdev.c     |    2 +-
> > >  drivers/s390/scsi/zfcp_aux.c |   23 ++++++++---------------
> > >  9 files changed, 18 insertions(+), 28 deletions(-)
> > > 
> > > --- a/drivers/s390/block/dcssblk.c
> > > +++ b/drivers/s390/block/dcssblk.c
> > > @@ -349,7 +349,7 @@ dcssblk_add_store(struct device *dev, st
> > >  	}
> > >  
> > >  	strcpy(dev_info->segment_name, local_buf);
> > > -	strlcpy(dev_info->dev.bus_id, local_buf, BUS_ID_SIZE);
> > > +	dev_set_name(&dev_info->dev, local_buf);
> > 
> > As I see it, dev_set_name accepts printf like string, so this
> > dev_set_name is quite dangerous (since local_buf is formed
> > by the module param), no?
> 
> So you would rather see:
> 	dev_set_name(&dev_info->dev, "%s", local_buf);
> 
> instead?

Yep.

There is another occurrence of "feels dangerous" construction in this
patch, namely

> --- a/drivers/s390/char/vmlogrdr.c
> +++ b/drivers/s390/char/vmlogrdr.c
> @@ -738,8 +738,7 @@ static int vmlogrdr_register_device(stru
> 
> 	dev = kzalloc(sizeof(struct device), GFP_KERNEL);
> 	if (dev) {
> -		snprintf(dev->bus_id, BUS_ID_SIZE, "%s",
> -			 priv->internal_name);
> +		dev_set_name(dev, priv->internal_name);

But in fact here it is safe, since the driver defines internal_name
to be either "logrec", "account" or "symptom". No % symbols.

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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