+ mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_set_filters_default_reject.patch added to mm-new branch

+ mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_set_filters_default_reject.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/tests/core-kunit: handle alloc failures on damon_test_set_filters_default_reject()
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_set_filters_default_reject.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_set_filters_default_reject.patch

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

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/tests/core-kunit: handle alloc failures on damon_test_set_filters_default_reject()
Date: Sat, 1 Nov 2025 11:20:10 -0700

damon_test_set_filters_default_reject() is assuming all dynamic memory
allocation in it will succeed.  Those are indeed likely in the real use
cases since those allocations are too small to fail, but theoretically
those could fail.  In the case, inappropriate memory access can happen. 
Fix it by appropriately cleanup pre-allocated memory and skip the
execution of the remaining tests in the failure cases.

Link: https://lkml.kernel.org/r/20251101182021.74868-17-sj@kernel.org
Fixes: 094fb14913c7 ("mm/damon/tests/core-kunit: add a test for damos_set_filters_default_reject()")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <stable@vger.kernel.org>	[6.16+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/tests/core-kunit.h |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/mm/damon/tests/core-kunit.h~mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_set_filters_default_reject
+++ a/mm/damon/tests/core-kunit.h
@@ -659,6 +659,8 @@ static void damon_test_set_filters_defau
 	KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, false);
 
 	target_filter = damos_new_filter(DAMOS_FILTER_TYPE_TARGET, true, true);
+	if (!target_filter)
+		kunit_skip(test, "filter alloc fail");
 	damos_add_filter(&scheme, target_filter);
 	damos_set_filters_default_reject(&scheme);
 	/*
@@ -684,6 +686,10 @@ static void damon_test_set_filters_defau
 	KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, false);
 
 	anon_filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true, true);
+	if (!anon_filter) {
+		damos_free_filter(target_filter);
+		kunit_skip(test, "anon_filter alloc fail");
+	}
 	damos_add_filter(&scheme, anon_filter);
 
 	damos_set_filters_default_reject(&scheme);
_

Patches currently in -mm which might be from sj@kernel.org are

mm-zswap-remove-unnecessary-dlen-writes-for-incompressible-pages.patch
mm-zswap-fix-typos-s-zwap-zswap.patch
mm-zswap-s-red-black-tree-xarray.patch
docs-admin-guide-mm-zswap-s-red-black-tree-xarray.patch
mm-damon-document-damos_quota_goal-nid-use-case.patch
mm-damon-add-damos-quota-goal-type-for-per-memcg-per-node-memory-usage.patch
mm-damon-core-implement-damos_quota_node_memcg_used_bp.patch
mm-damon-sysfs-schemes-implement-path-file-under-quota-goal-directory.patch
mm-damon-sysfs-schemes-support-damos_quota_node_memcg_used_bp.patch
mm-damon-core-add-damos-quota-gaol-metric-for-per-memcg-per-numa-free-memory.patch
mm-damon-sysfs-schemes-support-damos_quota_node_memcg_free_bp.patch
docs-mm-damon-design-document-damos_quota_node_memcg_usedfree_bp.patch
docs-admin-guide-mm-damon-usage-document-damos-quota-goal-path-file.patch
docs-abi-damon-document-damos-quota-goal-path-file.patch
mm-damon-core-fix-wrong-comment-of-damon_call-return-timing.patch
docs-mm-damon-design-fix-wrong-link-to-intervals-goal-section.patch
docs-admin-guide-mm-damon-stat-fix-a-typo-s-sampling-events-sampling-interval.patch
docs-admin-guide-mm-damon-usage-document-empty-target-regions-commit-behavior.patch
docs-admin-guide-mm-damon-reclaim-document-addr_unit-parameter.patch
docs-admin-guide-mm-damon-lru_sort-document-addr_unit-parameter.patch
docs-admin-guide-mm-damon-stat-document-aggr_interval_us-parameter.patch
docs-admin-guide-mm-damon-stat-document-negative-idle-time.patch
mm-damon-core-add-damon_target-obsolete-for-pin-point-removal.patch
mm-damon-sysfs-test-commit-input-against-realistic-destination.patch
mm-damon-sysfs-implement-obsolete_target-file.patch
docs-admin-guide-mm-damon-usage-document-obsolete_target-file.patch
docs-abi-damon-document-obsolete_target-sysfs-file.patch
selftests-damon-_damon_sysfs-support-obsolete_target-file.patch
drgn_dump_damon_status-dump-damon_target-obsolete.patch
sysfspy-extend-assert_ctx_committed-for-monitoring-targets.patch
selftests-damon-sysfs-add-obsolete_target-test.patch
mm-damon-tests-core-kunit-fix-memory-leak-in-damon_test_set_filters_default_reject.patch
mm-damon-tests-core-kunit-handle-allocation-failures-in-damon_test_regions.patch
mm-damon-tests-core-kunit-handle-memory-failure-from-damon_test_target.patch
mm-damon-tests-core-kunit-handle-memory-alloc-failure-from-damon_test_aggregate.patch
mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_split_at.patch
mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_merge_two.patch
mm-damon-tests-core-kunit-handle-alloc-failures-on-dasmon_test_merge_regions_of.patch
mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_split_regions_of.patch
mm-damon-tests-core-kunit-handle-alloc-failures-in-damon_test_ops_registration.patch
mm-damon-tests-core-kunit-handle-alloc-failures-in-damon_test_set_regions.patch
mm-damon-tests-core-kunit-handle-alloc-failures-in-damon_test_update_monitoring_result.patch
mm-damon-tests-core-kunit-handle-alloc-failure-on-damon_test_set_attrs.patch
mm-damon-tests-core-kunit-handle-alloc-failres-in-damon_test_new_filter.patch
mm-damon-tests-core-kunit-handle-alloc-failure-on-damos_test_commit_filter.patch
mm-damon-tests-core-kunit-handle-alloc-failures-on-damos_test_filter_out.patch
mm-damon-tests-core-kunit-handle-alloc-failures-on-damon_test_set_filters_default_reject.patch
mm-damon-tests-vaddr-kunit-handle-alloc-failures-on-damon_do_test_apply_three_regions.patch
mm-damon-tests-vaddr-kunit-handle-alloc-failures-in-damon_test_split_evenly_fail.patch
mm-damon-tests-vaddr-kunit-handle-alloc-failures-on-damon_test_split_evenly_succ.patch
mm-damon-tests-sysfs-kunit-handle-alloc-failures-on-damon_sysfs_test_add_targets.patch
mm-damon-tests-core-kunit-remove-unnecessary-damon_ctx-variable-on-damon_test_split_at.patch
mm-damon-tests-core-kunit-remove-unused-ctx-in-damon_test_split_regions_of.patch