linux-kernel - Re: [PATCH v2] cpufreq: kryo: Fix possible error code dereference

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Message-ID: <3263924.Aj9MpNRJPk@aspire.rjw.lan>
Date:   Thu, 21 Jun 2018 15:22:37 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Viresh Kumar <viresh.kumar@...aro.org>, ilia.lin@...il.com
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] cpufreq: kryo: Fix possible error code dereference

On Monday, June 18, 2018 6:55:23 AM CEST Viresh Kumar wrote:
> On 17-06-18, 21:58, ilia.lin@...il.com wrote:
> > From: Ilia Lin <ilia.lin@...il.com>
> > 
> > In event of error returned by the nvmem_cell_read() non-pointer value
> > may be dereferenced. Fix this with error handling.
> > Additionally free the allocated speedbin buffer, as per the API.
> > 
> > Fixes: 9ce36edd1a52 (cpufreq: Add Kryo CPU scaling driver)
> > Signed-off-by: Ilia Lin <ilia.lin@...il.com>
> > ---
> >  drivers/cpufreq/qcom-cpufreq-kryo.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c
> > index d049fe4b80c4..74b9b93d511b 100644
> > --- a/drivers/cpufreq/qcom-cpufreq-kryo.c
> > +++ b/drivers/cpufreq/qcom-cpufreq-kryo.c
> > @@ -115,6 +115,8 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
> >  
> >  	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
> >  	nvmem_cell_put(speedbin_nvmem);
> > +	if (IS_ERR(speedbin))
> > +		return PTR_ERR(speedbin);
> >  
> >  	switch (msm8996_version) {
> >  	case MSM8996_V3:
> > @@ -127,6 +129,7 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
> >  		BUG();
> >  		break;
> >  	}
> > +	kfree(speedbin);
> >  
> >  	for_each_possible_cpu(cpu) {
> >  		cpu_dev = get_cpu_device(cpu);
> 
> Ideally this should have been two patches as you were fixing two
> different problems. But anyway, you can go through this time.
> 
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

Patch applied, thanks!