linux-kernel - Re: opp_get_notifier() needs to be under rcu

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Message-id: <5729011.20441353491935757.JavaMail.weblogic@epml17>
Date:	Wed, 21 Nov 2012 09:58:56 +0000 (GMT)
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: opp_get_notifier() needs to be under rcu_lock?

> Hi,
> 
> It looks like find_device_opp() (called from opp_get_notifier()) needs
> to be under RCU read lock, but this doesn't seem to be happening in
> drivers/devfreq/devfreq.c. Doesn't this run the risk of referencing a
> freed variable?
> 
> Thanks,
> 
> -Kees

Yes, that's an issue requiring updates.

Thank you for pointing out.



Cheers,
MyungJoo

> 
> -- 
> Kees Cook
> Chrome OS Security
>