6.6-stable review patch. If anyone has any objections, please let me know.
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From: Quanmin Yan yanquanmin1@huawei.com
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 --- mm/damon/reclaim.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -167,6 +167,9 @@ static int damon_reclaim_apply_parameter 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;