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slub: ksize() abuse checks

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Add a WARN_ON for pages that don't have PageSlab nor PageCompound set to catch
the worst abusers of ksize() in the kernel.

Acked-by: Christoph Lameter <clameter@sgi.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Pekka Enberg 2008-05-22 19:22:25 +03:00
parent 239f49c080
commit 76994412f8
1 changed files with 3 additions and 2 deletions
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5
mm/slub.c
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@ -2726,9 +2726,10 @@ size_t ksize(const void *object)
page = virt_to_head_page(object); page = virt_to_head_page(object);
if (unlikely(!PageSlab(page))) if (unlikely(!PageSlab(page))) {
WARN_ON(!PageCompound(page));
return PAGE_SIZE << compound_order(page); return PAGE_SIZE << compound_order(page);
}
s = page->slab; s = page->slab;
#ifdef CONFIG_SLUB_DEBUG #ifdef CONFIG_SLUB_DEBUG