linux-kernel - Re: [PATCH] Fix uninitialized variable use in mm/memcontrol.c::mem_cgroup_move

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Date:	Mon, 24 Jan 2011 09:08:44 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Pavel Emelianov <xemul@...nvz.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH] Fix uninitialized variable use in
 mm/memcontrol.c::mem_cgroup_move_parent()

On Sat, 22 Jan 2011 20:51:32 +0100 (CET)
Jesper Juhl <jj@...osbits.net> wrote:

> In mm/memcontrol.c::mem_cgroup_move_parent() there's a path that jumps to 
> the 'put_back' label
>   	ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false, charge);
>   	if (ret || !parent)
>   		goto put_back;
>  where we'll 
>   	if (charge > PAGE_SIZE)
>   		compound_unlock_irqrestore(page, flags);
> but, we have not assigned anything to 'flags' at this point, nor have we 
> called 'compound_lock_irqsave()' (which is what sets 'flags').
> So, I believe the 'put_back' label should be moved below the call to 
> compound_unlock_irqrestore() as per this patch. 
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Thank you.

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Andrew, I'll move my new patces onto this. So, please pick this one 1st.

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