[PATCH] cpufreq: scmi: fix use-after-free in scmi_cpufreq_exit()

[PATCH] cpufreq: scmi: fix use-after-free in scmi_cpufreq_exit()

[Yangtao Li]

This issue was detected with the help of Coccinelle. So
change the order of function calls to fix it.

Fixes: 1690d8bb91e37 (cpufreq: scpi/scmi: Fix freeing of dynamic OPPs)

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
 drivers/cpufreq/scmi-cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index 242c3370544e..9ed46d188cb5 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -187,8 +187,8 @@ static int scmi_cpufreq_exit(struct cpufreq_policy *policy)
 
 	cpufreq_cooling_unregister(priv->cdev);
 	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
-	kfree(priv);
 	dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
+	kfree(priv);
 
 	return 0;
 }
-- 
2.17.0


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Re: [PATCH] cpufreq: scmi: fix use-after-free in scmi_cpufreq_exit()

[Viresh Kumar]

On 16-02-19, 11:31, Yangtao Li wrote:
> This issue was detected with the help of Coccinelle. So
> change the order of function calls to fix it.
> 
> Fixes: 1690d8bb91e37 (cpufreq: scpi/scmi: Fix freeing of dynamic OPPs)
> 
> Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
> ---
>  drivers/cpufreq/scmi-cpufreq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
> index 242c3370544e..9ed46d188cb5 100644
> --- a/drivers/cpufreq/scmi-cpufreq.c
> +++ b/drivers/cpufreq/scmi-cpufreq.c
> @@ -187,8 +187,8 @@ static int scmi_cpufreq_exit(struct cpufreq_policy *policy)
>  
>  	cpufreq_cooling_unregister(priv->cdev);
>  	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
> -	kfree(priv);
>  	dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
> +	kfree(priv);
>  
>  	return 0;
>  }

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

@Rafael: Please pick it up for 5.0-rc8 as the bug was introduced
during 5.0 cycle only.

The patch it fixes had this tag:

    Cc: 4.20 <stable@vger.kernel.org> # v4.20

And so will get applied to 4.20.N, I guess we need to mark this patch
as well for stable then.

-- 
viresh

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Re: [PATCH] cpufreq: scmi: fix use-after-free in scmi_cpufreq_exit()

[Rafael J. Wysocki]

On Monday, February 18, 2019 5:53:30 AM CET Viresh Kumar wrote:
> On 16-02-19, 11:31, Yangtao Li wrote:
> > This issue was detected with the help of Coccinelle. So
> > change the order of function calls to fix it.
> > 
> > Fixes: 1690d8bb91e37 (cpufreq: scpi/scmi: Fix freeing of dynamic OPPs)
> > 
> > Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
> > ---
> >  drivers/cpufreq/scmi-cpufreq.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
> > index 242c3370544e..9ed46d188cb5 100644
> > --- a/drivers/cpufreq/scmi-cpufreq.c
> > +++ b/drivers/cpufreq/scmi-cpufreq.c
> > @@ -187,8 +187,8 @@ static int scmi_cpufreq_exit(struct cpufreq_policy *policy)
> >  
> >  	cpufreq_cooling_unregister(priv->cdev);
> >  	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
> > -	kfree(priv);
> >  	dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
> > +	kfree(priv);
> >  
> >  	return 0;
> >  }
> 
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
> 
> @Rafael: Please pick it up for 5.0-rc8 as the bug was introduced
> during 5.0 cycle only.
> 
> The patch it fixes had this tag:
> 
>     Cc: 4.20 <stable@vger.kernel.org> # v4.20
> 
> And so will get applied to 4.20.N, I guess we need to mark this patch
> as well for stable then.

Done now, thanks!


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Re: [PATCH] cpufreq: scmi: fix use-after-free in scmi_cpufreq_exit()

[Sudeep Holla]

On Sat, Feb 16, 2019 at 11:31:48AM -0500, Yangtao Li wrote:
> This issue was detected with the help of Coccinelle. So
> change the order of function calls to fix it.
>
> Fixes: 1690d8bb91e37 (cpufreq: scpi/scmi: Fix freeing of dynamic OPPs)
>

Acked-by: Sudeep Holla <sudeep.holla@arm.com>

--
Regards,
Sudeep

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