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slub: fix ksize() for zero-sized pointers

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The slab and slob allocators already did this right, but slub would call
"get_object_page()" on the magic ZERO_SIZE_PTR, with all kinds of nasty
end results.

Noted by Ingo Molnar.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2007-07-19 13:21:34 -07:00
parent a5c96d8a1c
commit 9550b105b8
1 changed files with 1 additions and 1 deletions
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2
mm/slub.c
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@ -2394,7 +2394,7 @@ size_t ksize(const void *object)
struct page *page; struct page *page;
struct kmem_cache *s; struct kmem_cache *s;
if (object == ZERO_SIZE_PTR) if (ZERO_OR_NULL_PTR(object))
return 0; return 0;
page = get_object_page(object); page = get_object_page(object);