The patch titled Subject: mm/damon/core: fix divide error in damon_nr_accesses_to_accesses_bp() has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-damon-core-fix-divide-error-in-damon_nr_accesses_to_accesses_bp.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Kefeng Wang wangkefeng.wang@huawei.com Subject: mm/damon/core: fix divide error in damon_nr_accesses_to_accesses_bp() Date: Sat, 27 May 2023 11:21:01 +0800

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: 2f5bef5a590b ("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 ---

mm/damon/core.c | 2 ++ 1 file changed, 2 insertions(+)

--- a/mm/damon/core.c~mm-damon-core-fix-divide-error-in-damon_nr_accesses_to_accesses_bp +++ a/mm/damon/core.c @@ -551,6 +551,8 @@ int damon_set_attrs(struct damon_ctx *ct return -EINVAL; if (attrs->min_nr_regions > attrs->max_nr_regions) return -EINVAL; + if (attrs->sample_interval > attrs->aggr_interval) + return -EINVAL;

damon_update_monitoring_results(ctx, attrs); ctx->attrs = *attrs; _

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

mm-damon-core-fix-divide-error-in-damon_nr_accesses_to_accesses_bp.patch mm-memory_failure-move-memory_failure_attr_group-under-memory_failure.patch mm-memory-failure-move-sysctl-register-in-memory_failure_init.patch mm-page_alloc-move-mirrored_kernelcore-into-mm_initc.patch mm-page_alloc-move-init_on_alloc-free-into-mm_initc.patch mm-page_alloc-move-set_zone_contiguous-into-mm_initc.patch mm-page_alloc-collect-mem-statistic-into-show_memc.patch mm-page_alloc-squash-page_is_consistent.patch mm-page_alloc-remove-alloc_contig_dump_pages-stub.patch mm-page_alloc-split-out-fail_page_alloc.patch mm-page_alloc-split-out-debug_pagealloc.patch mm-page_alloc-move-mark_free_page-into-snapshotc.patch mm-page_alloc-move-pm_-function-into-power.patch mm-vmscan-use-gfp_has_io_fs.patch mm-page_alloc-move-sysctls-into-it-own-fils.patch mm-page_alloc-move-is_check_pages_enabled-into-page_allocc.patch