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| author | Pekka Enberg <penberg@cs.helsinki.fi> | 2010-04-07 19:23:41 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-04-09 10:09:50 -0700 |
| commit | d3e06e2b15590b70ea73733fc4612e4741ff46e0 (patch) | |
| tree | 021d71809197d8a195708ec9b3b114a0aa6eaa9c /mm/slub.c | |
| parent | fc1c183353a113c71675fecd0485e5aa0fe68d72 (diff) | |
| download | lwn-d3e06e2b15590b70ea73733fc4612e4741ff46e0.tar.gz lwn-d3e06e2b15590b70ea73733fc4612e4741ff46e0.zip | |
slub: Fix kmem_ptr_validate() for non-kernel pointers
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@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/slub.c b/mm/slub.c index b364844a1068..7d6c8b1ccf63 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) |