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slub: Fix a crash during slabinfo -v 

Commit f7cb193362 ("SLUB: Pass active
and inactive redzone flags instead of boolean to debug functions")
missed two instances of check_object(). This caused a lot of warnings
during 'slabinfo -v' finally leading to a crash:

  BUG ext4_xattr: Freepointer corrupt
  ...
  BUG buffer_head: Freepointer corrupt
  ...
  BUG ext4_alloc_context: Freepointer corrupt
  ...
  ...
  BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  IP: [<ffffffff810a291f>] file_sb_list_del+0x1c/0x35
  PGD 79d78067 PUD 79e67067 PMD 0
  Oops: 0002 [#1] SMP
  last sysfs file: /sys/kernel/slab/:t-0000192/validate

This patch fixes the problem by converting the two missed instances.

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tero Roponen <tero.roponen@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Tero Roponen 2010-12-01 20:04:20 +02:00 committed by Pekka Enberg
parent 85beb5869a
commit 8165984acf
1 changed files with 2 additions and 2 deletions
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4
mm/slub.c
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@ -3417,13 +3417,13 @@ static int validate_slab(struct kmem_cache *s, struct page *page,
for_each_free_object(p, s, page->freelist) { for_each_free_object(p, s, page->freelist) {
set_bit(slab_index(p, s, addr), map); set_bit(slab_index(p, s, addr), map);
if (!check_object(s, page, p, 0)) if (!check_object(s, page, p, SLUB_RED_INACTIVE))
return 0; return 0;
} }
for_each_object(p, s, addr, page->objects) for_each_object(p, s, addr, page->objects)
if (!test_bit(slab_index(p, s, addr), map)) if (!test_bit(slab_index(p, s, addr), map))
if (!check_object(s, page, p, 1)) if (!check_object(s, page, p, SLUB_RED_ACTIVE))
return 0; return 0;
return 1; return 1;
} }