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| author |   Rik van Riel <riel@surriel.com> | 2022-10-17 20:25:05 -0400 |
|---|---|---|
| committer |   Andrew Morton <akpm@linux-foundation.org> | 2022-10-20 21:27:23 -0700 |
| commit | 12df140f0bdfae5dcfc81800970dd7f6f632e00c (patch) | |
| tree | 4f01975b2e74e627bd9bdba5863b2f97622504c5 /arch | |
| parent | mm/mmap: fix MAP_FIXED address return on VMA merge (diff) | |
| download | linux-dev-12df140f0bdfae5dcfc81800970dd7f6f632e00c.tar.xz linux-dev-12df140f0bdfae5dcfc81800970dd7f6f632e00c.zip | |
mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages
The h->*_huge_pages counters are protected by the hugetlb_lock, but
alloc_huge_page has a corner case where it can decrement the counter
outside of the lock.
This could lead to a corrupted value of h->resv_huge_pages, which we have
observed on our systems.
Take the hugetlb_lock before decrementing h->resv_huge_pages to avoid a
potential race.
Link: https://lkml.kernel.org/r/20221017202505.0e6a4fcd@imladris.surriel.com
Fixes: a88c76954804 ("mm: hugetlb: fix hugepage memory leak caused by wrong reserve count")
Signed-off-by: Rik van Riel <riel@surriel.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Glen McCready <gkmccready@meta.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions