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mm/damon/tests/core-kunit: handle allocation failures in damon_test_regions()

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damon_test_regions() 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/20251101182021.74868-3-sj@kernel.org
Fixes: 17ccae8bb5 ("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>
This commit is contained in:
SeongJae Park 2025-11-01 11:19:56 -07:00 committed by Andrew Morton
parent b5ab490d85
commit e16fdd4f75
1 changed files with 6 additions and 0 deletions
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6
mm/damon/tests/core-kunit.h
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@ -20,11 +20,17 @@ static void damon_test_regions(struct kunit *test)
struct damon_target *t;
r = damon_new_region(1, 2);
if (!r)
kunit_skip(test, "region alloc fail");
KUNIT_EXPECT_EQ(test, 1ul, r->ar.start);
KUNIT_EXPECT_EQ(test, 2ul, r->ar.end);
KUNIT_EXPECT_EQ(test, 0u, r->nr_accesses);
t = damon_new_target();
if (!t) {
damon_free_region(r);
kunit_skip(test, "target alloc fail");
}
KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t));
damon_add_region(r, t);