linux-kernel - Re: [PATCH] thermal: cpu_cooling: fix out of bounds access in time_in

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Message-ID: <20160115152055.GA2917@e104805>
Date:	Fri, 15 Jan 2016 15:20:56 +0000
From:	Javi Merino <javi.merino@....com>
To:	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Amit Daniel Kachhap <amit.kachhap@...il.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH] thermal: cpu_cooling: fix out of bounds access in
 time_in_idle

Eduardo, Rui,

On Tue, Jan 05, 2016 at 07:19:25PM +0000, Javi Merino wrote:
> On Mon, Dec 21, 2015 at 08:49:40AM +0530, Viresh Kumar wrote:
> > On 19-12-15, 12:54, Javi Merino wrote:
> > > In __cpufreq_cooling_register() we allocate the arrays for time_in_idle
> > > and time_in_idle_timestamp to be as big as the number of cpus in this
> > > cpufreq device.  However, in get_load() we access this array using the
> > > cpu number as index, which can result in an out of bound access.
> > > 
> > > Index time_in_idle{,_timestamp} using the index in the cpufreq_device's
> > > allowed_cpus mask, as we do for the load_cpu array in
> > > cpufreq_get_requested_power()
> > > 
> > > Reported-by: Nicolas Boichat <drinkcat@...omium.org>
> > > Cc: Amit Daniel Kachhap <amit.kachhap@...il.com>
> > > Cc: Viresh Kumar <viresh.kumar@...aro.org>
> > > Cc: Zhang Rui <rui.zhang@...el.com>
> > > Cc: Eduardo Valentin <edubezval@...il.com>
> > > Signed-off-by: Javi Merino <javi.merino@....com>
> > > ---
> > >  drivers/thermal/cpu_cooling.c | 14 ++++++++------
> > >  1 file changed, 8 insertions(+), 6 deletions(-)
> > 
> > Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> 
> If there are no more objections, can you pick this up?

Another gentle ping, can this be merged?

Thanks,
Javi