linux-kernel - [PATCH 13/22] mm/damon/tests/core-kunit: handle alloc failres in damon_test_new

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Message-ID: <20251101182021.74868-14-sj@kernel.org>
Date: Sat,  1 Nov 2025 11:20:07 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	"# 6 . 6 . x" <stable@...r.kernel.org>,
	Brendan Higgins <brendan.higgins@...ux.dev>,
	David Gow <davidgow@...gle.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 13/22] 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.

Fixes: 2a158e956b98 ("mm/damon/core-test: add a test for damos_new_filter()")
Cc: <stable@...r.kernel.org> # 6.6.x
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/tests/core-kunit.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index b9bd69a57e62..03c7ac31db5c 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -505,6 +505,8 @@ static void damos_test_new_filter(struct kunit *test)
 	struct damos_filter *filter;
 
 	filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true, false);
+	if (!filter)
+		kunit_skip(test, "filter alloc fail");
 	KUNIT_EXPECT_EQ(test, filter->type, DAMOS_FILTER_TYPE_ANON);
 	KUNIT_EXPECT_EQ(test, filter->matching, true);
 	KUNIT_EXPECT_PTR_EQ(test, filter->list.prev, &filter->list);
-- 
2.47.3