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SLUB's ksize() fails for size > 2048

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I can't pass memory allocated by kmalloc() to ksize() if it is allocated by
SLUB allocator and size is larger than (I guess) PAGE_SIZE / 2.

The error of ksize() seems to be that it does not check if the allocation
was made by SLUB or the page allocator.

Reviewed-by: Pekka Enberg <[email protected]>
Tested-by: Tetsuo Handa <[email protected]>
Cc: Christoph Lameter <[email protected]>, Matt Mackall <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vegard Nossum 2007-12-04 23:45:30 -08:00 • committed by Linus Torvalds
commit 294a80a8ed
1 changed files with 5 additions and 1 deletions
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6
mm/slub.c
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@ -2558,8 +2558,12 @@ size_t ksize(const void *object)
if (unlikely(object == ZERO_SIZE_PTR))
return 0;
page = get_object_page(object);
page = virt_to_head_page(object);
BUG_ON(!page);
if (unlikely(!PageSlab(page)))
return PAGE_SIZE << compound_order(page);
s = page->slab;
BUG_ON(!s);