linux-kernel - Re: [PATCH] w1_therm reference count family data

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Message-Id: <5969431431529191@web10h.yandex.ru>
Date:	Wed, 13 May 2015 17:59:51 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	David Fries <david@...es.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Thorsten Bschorr <thorsten@...horr.de>,
	Jonathan ALIBERT <jonathan.alibert@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] w1_therm reference count family data

Hi

09.05.2015, 03:52, "David Fries" <David@...es.net>:
> A temperature conversion can take 750 ms and when possible the
> w1_therm slave driver drops the bus_mutex to allow other bus
> operations, but that includes operations such as a periodic slave
> search, which can remove this slave when it is no longer detected.
> If that happens the sl->family_data will be freed and set to NULL
> causing w1_slave_show to crash when it wakes up.
>
> Signed-off-by: David Fries <David@...es.net>
> Reported-By: Thorsten Bschorr <thorsten@...horr.de>
> Tested-by: Thorsten Bschorr <thorsten@...horr.de>
> Acked-by: Evgeniy Polyakov <zbr@...emap.net>
> ---
> This should be applied to the stable series as well.  In the name of
> full disclosure, this just narrows the race window, from crashing in
> normal operation on the reporters system to no longer crashing with
> multiple readers and another process hammering on inserting/removing
> the slave device.

Greg, please pull it upstream
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