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slub: Fix kmem_ptr_validate() for non-kernel pointers

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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 <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Matt Mackall <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Acked-by: David Rientjes <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Pekka Enberg 2010-04-07 19:23:41 +03:00 • committed by Linus Torvalds
commit d3e06e2b15
1 changed files with 3 additions and 0 deletions
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3
mm/slub.c
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@ -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)