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| author | SJ Park <sj@kernel.org> | 2026-07-14 20:09:57 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-07-28 21:22:30 -0700 |
| commit | bfc1848c766907e9c96d78acd5f44c5d58568e70 (patch) | |
| tree | 04184efc54db31dcc90eca5ea5380c8cc3565c85 /mm/damon | |
| parent | f869215a841f404c890a02e8876754fd3621bc33 (diff) | |
| download | linux-next-bfc1848c766907e9c96d78acd5f44c5d58568e70.tar.gz linux-next-bfc1848c766907e9c96d78acd5f44c5d58568e70.zip | |
mm/damon/tests/core-kunit: catch test failure in test_merge_regions_of()
KUNIT_EXPECT_EQ() does not abort the execution of test code when the
expectation is not met. But damon_test_merge_regions_of() code after its
initial KUNIT_EXPECT_EQ() call assumes the expectation is met. It does a
per-region test with a hard-coded number of regions that is correct only
if the expectation was met. As a result, __nth_region_of() could return
NULL, and the test code can dereference NULL pointers. Fix the issue by
catching the expectation failure and skip the per-region tests.
The user impact on realistic setups should be negligible, as it is a unit
test.
The issue was discovered [1] by Sashiko.
Link: https://lore.kernel.org/20260715031002.108504-3-sj@kernel.org
Link: https://lore.kernel.org/20260710144937.26981-1-sj@kernel.org [1]
Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests")
Signed-off-by: SJ Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> # 5.15.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/damon')
| -rw-r--r-- | mm/damon/tests/core-kunit.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h index 485472ddebd1..eba643762132 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -260,11 +260,14 @@ static void damon_test_merge_regions_of(struct kunit *test) damon_merge_regions_of(t, 9, 9999, ctx, true); /* 0-112, 114-130, 130-156, 156-170, 170-230, 230-10170 */ KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 6u); + if (damon_nr_regions(t) != 6) + goto out; for (i = 0; i < 6; i++) { r = __nth_region_of(t, i); KUNIT_EXPECT_EQ(test, r->ar.start, saddrs[i]); KUNIT_EXPECT_EQ(test, r->ar.end, eaddrs[i]); } +out: damon_free_target(t); damon_destroy_ctx(ctx); } |