linux-kernel - Re: [PATCH] of: fix race when matching drivers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <match-use-var@mdm.bga.com>
Date:	Wed, 18 May 2011 12:03:36 -0500
From:	Milton Miller <miltonm@....com>
To:	Grant Likely <grant.likely@...retlab.ca>,
	Josip Rodin <joy@...uzijast.net>
Cc:	David Miller <davem@...emloft.net>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org
Subject: Re: [PATCH] of: fix race when matching drivers

On Wed, 18 May 2011 about 10:21:39 -0600, Grant Likely wrote:
> On Wed, May 18, 2011 at 05:45:17PM +0200, Josip Rodin wrote:
> > On Wed, May 18, 2011 at 10:27:39AM -0500, Milton Miller wrote:
> > > --- work.git.orig/include/linux/of_device.h	2011-05-18 09:57:01.014386816 -0500
> > > +++ work.git/include/linux/of_device.h	2011-05-18 09:58:27.537431575 -0500
> > > @@ -21,8 +21,15 @@ extern void of_device_make_bus_id(struct
> > >  static inline int of_driver_match_device(struct device *dev,
> > >  					 const struct device_driver *drv)
> > >  {
> > > -	dev->of_match = of_match_device(drv->of_match_table, dev);
> > > -	return dev->of_match != NULL;
> > > +	const struct of_device_id *match;
> > > +
> > > +	match = of_match_device(drv->of_match_table, dev);
> > > +	if (match) {
> > > +		dev->of_match = of_match_device(drv->of_match_table, dev);
> > > +		return 1;
> > > +	}
> > > +
> > > +	return 0;
> > >  }
> > 
> > Err, is there some reason to avoid simply assigning the existing result:
> > dev->of_match = match; ?
> 
> Good point.  I've committed and am currently testing the modified version.
> 
> g.

Sorry about that.  I had intended to do that (hence creating the
variable), but obvioiusly I forgot when I hurried to compile test
and send out the patch.

thanks to Josip for finding and Grant for fixing.

milton
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/