From: Christoph Lameter on

Acked-by: Christoph Lameter <cl(a)linux-foundation.org>
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From: David Rientjes on
On Wed, 7 Apr 2010, Pekka Enberg wrote:

> As suggested by Linus, fix up kmem_ptr_validate() to handle non-kernel pointers
> more graciously. The patch changes kmem_ptr_validate() to use the newly
> introduced kern_ptr_validate() helper to check that a pointer is a valid kernel
> pointer before we attempt to convert it into a 'struct page'.
>
> Cc: Andrew Morton <akpm(a)linux-foundation.org>
> Cc: Christoph Lameter <cl(a)linux-foundation.org>
> Cc: David Rientjes <rientjes(a)google.com>

Acked-by: David Rientjes <rientjes(a)google.com>

> Cc: Ingo Molnar <mingo(a)elte.hu>
> Cc: Matt Mackall <mpm(a)selenic.com>
> Cc: Nick Piggin <npiggin(a)suse.de>
> Signed-off-by: Pekka Enberg <penberg(a)cs.helsinki.fi>
> ---
> mm/slub.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/mm/slub.c b/mm/slub.c
> index b364844..7d6c8b1 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2386,6 +2386,9 @@ int kmem_ptr_validate(struct kmem_cache *s, const void *object)
> {
> struct page *page;
>
> + if (!kern_ptr_validate(object, s->size))
> + return 0;
> +
> page = get_object_page(object);
>
> if (!page || s != page->slab)
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