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/[email protected]
Fixes: f5a79d7 ("mm/damon: introduce struct damos_access_pattern")
Signed-off-by: Quanmin Yan <[email protected]>
Reviewed-by: SeongJae Park <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: ze zuo <[email protected]>
Cc: <[email protected]>	[6.1+]
Signed-off-by: Andrew Morton <[email protected]>

Author: Quanmin Yan

mm/damon/reclaim.c

@@ -194,6 +194,11 @@ static int damon_reclaim_apply_parameters(void)
 	if (err)
 		return err;
 
+	if (!damon_reclaim_mon_attrs.aggr_interval) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	err = damon_set_attrs(param_ctx, &damon_reclaim_mon_attrs);
 	if (err)
 		goto out;