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mm/damon/tests/core-kunit: handle alloc failres in damon_test_new_filter()

damon_test_new_filter() 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/20251101182021.74868-14-sj@kernel.org
Fixes: 2a158e956b98 ("mm/damon/core-test: add a test for damos_new_filter()")
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> [6.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

SeongJae Park and committed by
Andrew Morton 28ab2265 915a2453

+2
+2
mm/damon/tests/core-kunit.h
··· 505 505 struct damos_filter *filter; 506 506 507 507 filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true, false); 508 + if (!filter) 509 + kunit_skip(test, "filter alloc fail"); 508 510 KUNIT_EXPECT_EQ(test, filter->type, DAMOS_FILTER_TYPE_ANON); 509 511 KUNIT_EXPECT_EQ(test, filter->matching, true); 510 512 KUNIT_EXPECT_PTR_EQ(test, filter->list.prev, &filter->list);