linux-kernel - Re: [PATCH 3/7] mm/slub.c: remove invalid reference to list iterator variable

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Message-ID: <alpine.LFD.2.02.1207091204450.3050@tux.localdomain>
Date:	Mon, 9 Jul 2012 12:04:52 +0300 (EEST)
From:	Pekka Enberg <penberg@...nel.org>
To:	Julia Lawall <Julia.Lawall@...6.fr>
cc:	Christoph Lameter <cl@...ux-foundation.org>,
	kernel-janitors@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] mm/slub.c: remove invalid reference to list iterator
 variable

On Sun, 8 Jul 2012, Julia Lawall wrote:

> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> If list_for_each_entry, etc complete a traversal of the list, the iterator
> variable ends up pointing to an address at an offset from the list head,
> and not a meaningful structure.  Thus this value should not be used after
> the end of the iterator.  The patch replaces s->name by al->name, which is
> referenced nearby.
> 
> This problem was found using Coccinelle (http://coccinelle.lip6.fr/).
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
>  mm/slub.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index cc4ed03..ef9bf01 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -5395,7 +5395,7 @@ static int __init slab_sysfs_init(void)
>  		err = sysfs_slab_alias(al->s, al->name);
>  		if (err)
>  			printk(KERN_ERR "SLUB: Unable to add boot slab alias"
> -					" %s to sysfs\n", s->name);
> +					" %s to sysfs\n", al->name);
>  		kfree(al);
>  	}

Applied, thanks!
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