linux-kernel - Re: [PATCH] cpufreq: Fix NULL reference crash while accessing policy->governor

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Message-ID: <30317803.WdZJECVyOY@vostro.rjw.lan>
Date:	Tue, 26 Jan 2016 23:49:48 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Juri Lelli <juri.lelli@....com>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	"# v4 . 2+" <stable@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Juri Lelli <Juri.Lelli@....com>
Subject: Re: [PATCH] cpufreq: Fix NULL reference crash while accessing policy->governor_data

On Tuesday, January 26, 2016 06:01:19 PM Juri Lelli wrote:
> On 26/01/16 09:57, Juri Lelli wrote:
> > Hi Viresh,
> > 
> > On 25/01/16 22:33, Viresh Kumar wrote:
> > > There is a little race discovered by Juri, where we are able to:
> > > - create and read a sysfs file before policy->governor_data is being set
> > >   to a non NULL value.
> > >   OR
> > > - set policy->governor_data to NULL, and reading a file before being
> > >   destroyed.
> > > 

[cut]

> 
> So, this goes away with your patch (that I forward ported) and a small
> additional fix on top of that.

Which patch exactly is that?

Thanks,
Rafael