Commit 76994412f8e824e79a593d6777ec327d85f942b2
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239f49c080
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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>
Showing 1 changed file with 3 additions and 2 deletions Side-by-side Diff
mm/slub.c
| ... | ... | @@ -2726,9 +2726,10 @@ |
| 2726 | 2726 | |
| 2727 | 2727 | page = virt_to_head_page(object); |
| 2728 | 2728 | |
| 2729 | - if (unlikely(!PageSlab(page))) | |
| 2729 | + if (unlikely(!PageSlab(page))) { | |
| 2730 | + WARN_ON(!PageCompound(page)); | |
| 2730 | 2731 | return PAGE_SIZE << compound_order(page); |
| 2731 | - | |
| 2732 | + } | |
| 2732 | 2733 | s = page->slab; |
| 2733 | 2734 | |
| 2734 | 2735 | #ifdef CONFIG_SLUB_DEBUG |