slub: ksize() abuse checks

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>

diff --git a/mm/slub.c b/mm/slub.c
index a505a82..0987d1c 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2726,9 +2726,10 @@ size_t ksize(const void *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);
-
+       }
        s = page->slab;
 
 #ifdef CONFIG_SLUB_DEBUG