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Date:	Sun, 26 Oct 2014 10:44:50 +0900
From:	Minchan Kim <>
To:	Weijie Yang <>
Cc:	'Andrew Morton' <>,
	'Dan Streetman' <>,
	'Sergey Senozhatsky' <>,
	'Nitin Gupta' <>,
	'Linux-MM' <>,
	'linux-kernel' <>,
	'Weijie Yang' <>
Subject: Re: [PATCH 2/2] zram: avoid NULL pointer access when reading

On Sat, Oct 25, 2014 at 05:26:31PM +0800, Weijie Yang wrote:
> There is a rare NULL pointer bug in mem_used_total_show() in concurrent
> situation, like this:
> zram is not initialized, process A is a mem_used_total reader which runs
> periodicity, while process B try to init zram.
> 	process A 				process B
> access meta, get a NULL value
> 						init zram, done
> init_done() is true
> access meta->mem_pool, get a NULL pointer BUG
> This patch fixes this issue.
> Signed-off-by: Weijie Yang <>
Acked-by: Minchan Kim <>


Kind regards,
Minchan Kim
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