Re: [PATCH -mm 2/8] memcg: keep all children of each root cache on a list

[Christoph Lameter]

On Mon, 7 Jul 2014, Vladimir Davydov wrote:

> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index d31c4bacc6a2..95a8f772b0d1 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -294,8 +294,12 @@ struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
>  	if (IS_ERR(s)) {
>  		kfree(cache_name);
>  		s = NULL;
> +		goto out_unlock;
>  	}
>
> +	list_add(&s->memcg_params->siblings,
> +		 &root_cache->memcg_params->children);
> +
>  out_unlock:
>  	mutex_unlock(&slab_mutex);
>

If there is an error then s is set to NULL. And then
the list_add is done dereferencing s?
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