diff options
| author | Quanmin Yan <yanquanmin1@huawei.com> | 2025-08-27 19:58:58 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-19 16:37:34 +0200 |
| commit | 40cb9b38b645126fdd1d6aa3d6811a8ad50ddfa1 (patch) | |
| tree | 5974ac9e1ed41d41184032a471bc427f2c60c5d8 | |
| parent | 4e87f461d61959647464a94d11ae15c011be58ce (diff) | |
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>
| -rw-r--r-- | mm/damon/reclaim.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index a675150965e0..ade3ff724b24 100644 --- a/mm/damon/reclaim.c +++ b/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(ctx, &damon_reclaim_mon_attrs); if (err) goto out; |