linux-kernel - Re: [PATCH v2] slab: Fix nodeid bounds check for non-contiguous node IDs

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Date:	Mon, 01 Dec 2014 11:22:27 +0200
From:	Pekka Enberg <penberg@....fi>
To:	Paul Mackerras <paulus@...ba.org>, linux-mm@...ck.org
CC:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] slab: Fix nodeid bounds check for non-contiguous node
 IDs

On 12/1/14 6:28 AM, Paul Mackerras wrote:
> ---
> v2: include the oops message in the patch description
>
>   mm/slab.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/slab.c b/mm/slab.c
> index eb2b2ea..f34e053 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -3076,7 +3076,7 @@ static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
>   	void *obj;
>   	int x;
>   
> -	VM_BUG_ON(nodeid > num_online_nodes());
> +	VM_BUG_ON(nodeid < 0 || nodeid >= MAX_NUMNODES);
>   	n = get_node(cachep, nodeid);
>   	BUG_ON(!n);

Reviewed-by: Pekka Enberg <penberg@...nel.org>

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