[PATCH 16/22] mm/damon/tests/core-kunit: handle alloc failures on damon_test_set_filters_default_reject()

[SeongJae Park]

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.

Fixes: 094fb14913c7 ("mm/damon/tests/core-kunit: add a test for 
damos_set_filters_default_reject()")
Cc: <sta...@vger.kernel.org> # 6.16.x
Signed-off-by: SeongJae Park <s...@kernel.org>
---
 mm/damon/tests/core-kunit.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index a03ae9ddd88a..a91d798caa70 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -659,6 +659,8 @@ static void damon_test_set_filters_default_reject(struct 
kunit *test)
        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_default_reject(struct 
kunit *test)
        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);
-- 
2.47.3