linux-kernel - Re: [PATCH v2 08/10] zram: protect sysfs handler from invalid memory access

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Message-ID: <20130605070322.GH8732@blaptop>
Date:	Wed, 5 Jun 2013 16:03:22 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Jiang Liu <jiang.liu@...wei.com>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/10] zram: protect sysfs handler from invalid memory
 access

On Wed, Jun 05, 2013 at 12:06:06AM +0800, Jiang Liu wrote:
> Use zram->init_lock to protect access to zram->meta, otherwise it
> may cause invalid memory access if zram->meta has been freed by
> zram_reset_device().
> 
> This issue may be triggered by:
> Thread 1:
> while true; do cat mem_used_total; done
> Thread 2:
> while true; do echo 8M > disksize; echo 1 > reset; done
> 
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Cc: stable@...r.kernel.org

Acked-by: Minchan Kim <minchan@...nel.org>


-- 
Kind regards,
Minchan Kim
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