linux-kernel - Re: [patch] memcontrol: fix potential null deref

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Message-Id: <20100315090451.ebd0ea2c.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 15 Mar 2010 09:04:51 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Dan Carpenter <error27@...il.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [patch] memcontrol: fix potential null deref

On Sat, 13 Mar 2010 17:56:21 +0300
Dan Carpenter <error27@...il.com> wrote:

> There was a potential null deref introduced in:
> c62b1a3b31b5 memcg: use generic percpu instead of private implementation
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>

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

> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 7973b52..e1e0996 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3691,8 +3691,10 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
>  	else
>  		mem = vmalloc(size);
>  
> -	if (mem)
> -		memset(mem, 0, size);
> +	if (!mem)
> +		return NULL;
> +
> +	memset(mem, 0, size);
>  	mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
>  	if (!mem->stat) {
>  		if (size < PAGE_SIZE)
> --
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