linux-kernel - [PATCH 12/22] mm/damon/tests/core-kunit: handle alloc failure on damon_test_set

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Message-ID: <20251101182021.74868-13-sj@kernel.org>
Date: Sat,  1 Nov 2025 11:20:06 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	"# 6 . 5 . x" <stable@...r.kernel.org>,
	Brendan Higgins <brendan.higgins@...ux.dev>,
	David Gow <davidgow@...gle.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	damon@...ts.linux.dev,
	kunit-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 12/22] mm/damon/tests/core-kunit: handle alloc failure on damon_test_set_attrs()

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.

Fixes: aa13779be6b7 ("mm/damon/core-test: add a test for damon_set_attrs()")
Cc: <stable@...r.kernel.org> # 6.5.x
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/tests/core-kunit.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 10c9953581ee..b9bd69a57e62 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -465,6 +465,9 @@ 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