linux-kernel - Re: [PATCH] slub: avoid potential NULL dereference or corruption

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Date:	Tue, 22 Nov 2011 08:57:01 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] slub: avoid potential NULL dereference or corruption

On Tue, 22 Nov 2011, Eric Dumazet wrote:

> diff --git a/mm/slub.c b/mm/slub.c
> index 7d2a996..e8e6714 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -4436,29 +4436,33 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
>  		for_each_possible_cpu(cpu) {
>  			struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);
>  			struct page *page;
> +			int node;
>
> -			if (!c || c->node < 0)
> +			if (!c)
>  				continue;

Drop the check. c can never be NULL these days.

Otherwiswe it looks okay.

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