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mm/damon/core: fix divide error in damon_nr_accesses_to_accesses_bp()

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If 'aggr_interval' is smaller than 'sample_interval', max_nr_accesses in
damon_nr_accesses_to_accesses_bp() becomes zero which leads to divide
error, let's validate the values of them in damon_set_attrs() to fix it,
which similar to others attrs check.

Link: https://lkml.kernel.org/r/20230527032101.167788-1-wangkefeng.wang@huawei.com
Fixes: 2f5bef5a59 ("mm/damon/core: update monitoring results for new monitoring attributes")
Reported-by: syzbot+841a46899768ec7bec67@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=841a46899768ec7bec67
Link: https://lore.kernel.org/damon/00000000000055fc4e05fc975bc2@google.com/
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2023-05-27 11:21:01 +08:00 • committed by Andrew Morton
parent 2192bba03d
commit 5ff6e2fff8
1 changed files with 2 additions and 0 deletions
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2
mm/damon/core.c
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@ -551,6 +551,8 @@ int damon_set_attrs(struct damon_ctx *ctx, struct damon_attrs *attrs)
return -EINVAL; return -EINVAL;
if (attrs->min_nr_regions > attrs->max_nr_regions) if (attrs->min_nr_regions > attrs->max_nr_regions)
return -EINVAL; return -EINVAL;
if (attrs->sample_interval > attrs->aggr_interval)
return -EINVAL;
damon_update_monitoring_results(ctx, attrs); damon_update_monitoring_results(ctx, attrs);
ctx->attrs = *attrs; ctx->attrs = *attrs;