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mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters()

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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: f5a79d7c0c ("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>
This commit is contained in:
Quanmin Yan
2025-08-27 19:58:58 +08:00
committed by Greg Kroah-Hartman
parent 60d7a3d2b9
commit 9fe0415156
1 changed files with 3 additions and 0 deletions
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3
mm/damon/reclaim.c
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@@ -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;