[PATCH 6.6.y] mm/damon/tests/core-kunit: handle alloc failures in damon_test_ops_registration()

[SeongJae Park <sj@kernel.org>]

damon_test_ops_registration() 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/20251101182021.74868-10-sj@kernel.org
Fixes: 4f540f5ab4f2 ("mm/damon/core-test: add a kunit test case for ops registration")
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>	[5.19+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 4f835f4e8c863985f15abd69db033c2f66546094)
Signed-off-by: SeongJae Park <sj@kernel.org>
---
 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..9d1a4073d0cc 100644
--- a/mm/damon/core-test.h
+++ b/mm/damon/core-test.h
@@ -237,6 +237,9 @@ static void damon_test_ops_registration(struct kunit *test)
 	struct damon_ctx *c = damon_new_ctx();
 	struct damon_operations ops, bak;
 
+	if (!c)
+		kunit_skip(test, "ctx alloc fail");
+
 	/* DAMON_OPS_{V,P}ADDR are registered on subsys_initcall */
 	KUNIT_EXPECT_EQ(test, damon_select_ops(c, DAMON_OPS_VADDR), 0);
 	KUNIT_EXPECT_EQ(test, damon_select_ops(c, DAMON_OPS_PADDR), 0);
-- 
2.47.3