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Commit d3e06e2b authored by Pekka Enberg's avatar Pekka Enberg Committed by Linus Torvalds
Browse files

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: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Acked-by: default avatarChristoph Lameter <cl@linux-foundation.org>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fc1c1833

mm/slub.c

+3 −0
Original line number Diff line number Diff line
@@ -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)