[PATCH 6.6.y] mm/damon/tests/core-kunit: handle alloc failure on damon_test_set_attrs()

[PATCH 6.6.y] mm/damon/tests/core-kunit: handle alloc failure on damon_test_set_attrs()

[SeongJae Park]

damon_test_set_attrs() 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/20251101182021.74868-13-sj@kernel.org
Fixes: aa13779be6b7 ("mm/damon/core-test: add a test for damon_set_attrs()")
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>	[6.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 915a2453d824a9b6bf724e3f970d86ae1d092a61)
---
 mm/damon/core-test.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h
index 6cc8b245586d..454e9e0b525e 100644
--- a/mm/damon/core-test.h
+++ b/mm/damon/core-test.h
@@ -326,6 +326,9 @@ static void damon_test_set_attrs(struct kunit *test)
 		.sample_interval = 5000, .aggr_interval = 100000,};
 	struct damon_attrs invalid_attrs;
 
+	if (!c)
+		kunit_skip(test, "ctx alloc fail");
+
 	KUNIT_EXPECT_EQ(test, damon_set_attrs(c, &valid_attrs), 0);
 
 	invalid_attrs = valid_attrs;
-- 
2.47.3