linux-kernel - Re: [PATCH] clocksource: mtk: Fix race conditions in probe code

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Message-ID: <54EC2538.1070005@linaro.org>
Date:	Tue, 24 Feb 2015 08:16:08 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Matthias Brugger <matthias.bgg@...il.com>, tglx@...utronix.de
CC:	yongbae2@...il.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, stable@...r.kernel.org
Subject: Re: [PATCH] clocksource: mtk: Fix race conditions in probe code

On 02/19/2015 11:41 AM, Matthias Brugger wrote:
> We have two race conditions in the probe code which could lead to a null
> pointer dereference in the interrupt handler.
>
> The interrupt handler accesses the clockevent device, which may not yet be
> registered.
>
> First race condition happens when the interrupt handler gets registered before
> the interrupts get disabled. The second race condition happens when the
> interrupts get enabled, but the clockevent device is not yet registered.
>
> Fix that by disabling the interrupts before we register the interrupt and enable
> the interrupts after the clockevent device got registered.
>
> Reported-by: Gongbae Park <yongbae2@...il.com>
> Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>
> Cc: stable@...r.kernel.org
> ---

Applied to my tree as a fix for 3.20.

Thanks !

   -- Daniel

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