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| author | Jianguo Wu <wujianguo@huawei.com> | 2013-12-18 17:08:54 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-25 08:27:11 -0800 |
| commit | deb19aafd901b60f7192b1e16073ec6673d5c98b (patch) | |
| tree | 24f9f455fda5003d902bec2f2150356b7ce9c9c0 /mm/maccess.c | |
| parent | 350f737ed039d2b36329ddcbcdf78e12c6d8c758 (diff) | |
mm/memory-failure.c: recheck PageHuge() after hugetlb page migrate successfully
commit a49ecbcd7b0d5a1cda7d60e03df402dd0ef76ac8 upstream.
After a successful hugetlb page migration by soft offline, the source
page will either be freed into hugepage_freelists or buddy(over-commit
page). If page is in buddy, page_hstate(page) will be NULL. It will
hit a NULL pointer dereference in dequeue_hwpoisoned_huge_page().
BUG: unable to handle kernel NULL pointer dereference at 0000000000000058
IP: [<ffffffff81163761>] dequeue_hwpoisoned_huge_page+0x131/0x1d0
PGD c23762067 PUD c24be2067 PMD 0
Oops: 0000 [#1] SMP
So check PageHuge(page) after call migrate_pages() successfully.
[wujg: backport to 3.10:
- adjust context]
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Tested-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/maccess.c')
0 files changed, 0 insertions, 0 deletions