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| author | Quanmin Yan <yanquanmin1@huawei.com> | 2025-08-27 19:58:58 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-19 16:32:04 +0200 |
| commit | 9fe0415156fbde773b31f920201cb70b1f0e40fe (patch) | |
| tree | 933e8788e819ae25ff0e579bb37e096af160a28f /mm | |
| parent | 60d7a3d2b985a395318faa1d88da6915fad11c19 (diff) | |
| download | linux-9fe0415156fbde773b31f920201cb70b1f0e40fe.tar.gz linux-9fe0415156fbde773b31f920201cb70b1f0e40fe.tar.bz2 linux-9fe0415156fbde773b31f920201cb70b1f0e40fe.zip | |
mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters()
commit e6b543ca9806d7bced863f43020e016ee996c057 upstream.
When creating a new scheme of DAMON_RECLAIM, the calculation of
'min_age_region' uses 'aggr_interval' as the divisor, which may lead to
division-by-zero errors. Fix it by directly returning -EINVAL when such a
case occurs.
Link: https://lkml.kernel.org/r/20250827115858.1186261-3-yanquanmin1@huawei.com
Fixes: f5a79d7c0c87 ("mm/damon: introduce struct damos_access_pattern")
Signed-off-by: Quanmin Yan <yanquanmin1@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: ze zuo <zuoze1@huawei.com>
Cc: <stable@vger.kernel.org> [6.1+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/damon/reclaim.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index 66e190f0374a..586daa2cefe4 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -167,6 +167,9 @@ static int damon_reclaim_apply_parameters(void) struct damos_filter *filter; int err = 0; + if (!damon_reclaim_mon_attrs.aggr_interval) + return -EINVAL; + err = damon_set_attrs(ctx, &damon_reclaim_mon_attrs); if (err) return err; |