Re: [PATCH v3 2/3] mm/sparse: fix possible memory leak

[David Rientjes <rientjes@google.com>]

On Mon, 2 Jul 2012, Gavin Shan wrote:

> diff --git a/mm/sparse.c b/mm/sparse.c
> index 781fa04..a6984d9 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -75,6 +75,20 @@ static struct mem_section noinline __init_refok *sparse_index_alloc(int nid)
>  	return section;
>  }
>  
> +static inline void __meminit sparse_index_free(struct mem_section *section)
> +{
> +	unsigned long size = SECTIONS_PER_ROOT *
> +			     sizeof(struct mem_section);
> +
> +	if (!section)
> +		return;
> +
> +	if (slab_is_available())
> +		kfree(section);
> +	else
> +		free_bootmem(virt_to_phys(section), size);

Eek, does that work?

> +}
> +
>  static int __meminit sparse_index_init(unsigned long section_nr, int nid)
>  {
>  	static DEFINE_SPINLOCK(index_init_lock);
> @@ -102,6 +116,9 @@ static int __meminit sparse_index_init(unsigned long section_nr, int nid)
>  	mem_section[root] = section;
>  out:
>  	spin_unlock(&index_init_lock);
> +	if (ret)
> +		sparse_index_free(section);
> +
>  	return ret;
>  }
>  #else /* !SPARSEMEM_EXTREME */

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