linux-kernel - Re: [PATCH v3 06/10] zram: protect sysfs handler from invalid memory access

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Message-ID: <51B1AACD.7070403@redhat.com>
Date:	Fri, 07 Jun 2013 11:41:33 +0200
From:	Jerome Marchand <jmarchan@...hat.com>
To:	Jiang Liu <liuj97@...il.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3 06/10] zram: protect sysfs handler from invalid memory
 access

On 06/06/2013 06:07 PM, 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>
> Acked-by: Minchan Kim <minchan@...nel.org>
> Cc: stable@...r.kernel.org

Acked-by: Jerome Marchand <jmarchan@...hat.com>

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