The patch titled Subject: mm/damon/tests/core-kunit: handle memory alloc failure from damon_test_aggregate() has been added to the -mm mm-new branch. Its filename is mm-damon-tests-core-kunit-handle-memory-alloc-failure-from-damon_test_aggregate.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-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: SeongJae Park sj@kernel.org Subject: mm/damon/tests/core-kunit: handle memory alloc failure from damon_test_aggregate() Date: Sat, 1 Nov 2025 11:19:58 -0700
damon_test_aggregate() 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/20251101182021.74868-5-sj@kernel.org Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests") 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 [5.15+] Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/damon/tests/core-kunit.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- a/mm/damon/tests/core-kunit.h~mm-damon-tests-core-kunit-handle-memory-alloc-failure-from-damon_test_aggregate +++ a/mm/damon/tests/core-kunit.h @@ -97,8 +97,15 @@ static void damon_test_aggregate(struct struct damon_region *r; int it, ir;
+ if (!ctx) + kunit_skip(test, "ctx alloc fail"); + for (it = 0; it < 3; it++) { t = damon_new_target(); + if (!t) { + damon_destroy_ctx(ctx); + kunit_skip(test, "target alloc fail"); + } damon_add_target(ctx, t); }
@@ -106,6 +113,10 @@ static void damon_test_aggregate(struct damon_for_each_target(t, ctx) { for (ir = 0; ir < 3; ir++) { r = damon_new_region(saddr[it][ir], eaddr[it][ir]); + if (!r) { + damon_destroy_ctx(ctx); + kunit_skip(test, "region alloc fail"); + } r->nr_accesses = accesses[it][ir]; r->nr_accesses_bp = accesses[it][ir] * 10000; damon_add_region(r, t); _
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