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| author | Rik van Riel <[email protected]> | 2022-10-18 00:25:05 +0000 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2022-10-21 04:27:23 +0000 |
| commit | 12df140f0bdfae5dcfc81800970dd7f6f632e00c (patch) | |
| tree | 4f01975b2e74e627bd9bdba5863b2f97622504c5 /drivers/platform/surface/aggregator/ssh_parser.c | |
| parent | mm/mmap: fix MAP_FIXED address return on VMA merge (diff) | |
| download | kernel-12df140f0bdfae5dcfc81800970dd7f6f632e00c.tar.gz kernel-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/[email protected]
Fixes: a88c76954804 ("mm: hugetlb: fix hugepage memory leak caused by wrong reserve count")
Signed-off-by: Rik van Riel <[email protected]>
Reviewed-by: Mike Kravetz <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Glen McCready <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Diffstat (limited to 'drivers/platform/surface/aggregator/ssh_parser.c')
0 files changed, 0 insertions, 0 deletions