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

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>

authored by

Quanmin Yan and committed by
Andrew Morton e6b543ca 711f19df

+5
+5
mm/damon/reclaim.c
··· 194 194 if (err) 195 195 return err; 196 196 197 + if (!damon_reclaim_mon_attrs.aggr_interval) { 198 + err = -EINVAL; 199 + goto out; 200 + } 201 + 197 202 err = damon_set_attrs(param_ctx, &damon_reclaim_mon_attrs); 198 203 if (err) 199 204 goto out;