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

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Message-ID: <CAGXu5j+g8inUZV43GFQzs9KpRvjPGPTJsXinb4Y=wOuOf2jnVQ@mail.gmail.com>
Date:	Tue, 20 Nov 2012 12:08:26 -0800
From:	Kees Cook <keescook@...omium.org>
To:	MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: 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

-- 
Kees Cook
Chrome OS Security
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