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mm, hwpoison: fix page refcnt leaking in try_memory_failure_hugetlb()

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Patch series "A few fixup patches for memory-failure", v2.

This series contains a few fixup patches to fix incorrect update of page
refcnt, fix possible use-after-free issue and so on.  More details can be
found in the respective changelogs.

This patch (of 6):

When hwpoison_filter() refuses to hwpoison a hugetlb page, the refcnt of
the page would have been incremented if res == 1.  Using put_page() to fix
the refcnt leaking in this case.

Link: https://lkml.kernel.org/r/20220823032346.4260-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220818130016.45313-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220818130016.45313-2-linmiaohe@huawei.com
Fixes: 405ce05123 ("mm/hwpoison: fix race between hugetlb free/demotion and memory_failure_hugetlb()")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-08-18 21:00:11 +08:00 committed by Andrew Morton
parent b1d5488a25
commit f36a5543a7
1 changed files with 4 additions and 2 deletions
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6
mm/memory-failure.c
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@ -1860,8 +1860,10 @@ retry:
if (hwpoison_filter(p)) {
hugetlb_clear_page_hwpoison(head);
res = -EOPNOTSUPP;
goto out;
unlock_page(head);
if (res == 1)
put_page(head);
return -EOPNOTSUPP;
}
/*