linux-kernel - [PATCH 03/22] mm/damon/tests/core-kunit: handle memory failure from damon_test

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Message-ID: <20251101182021.74868-4-sj@kernel.org>
Date: Sat,  1 Nov 2025 11:19:57 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	"# 5 . 15 . 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 03/22] mm/damon/tests/core-kunit: handle memory failure from damon_test_target()

damon_test_target() 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: 17ccae8bb5c9 ("mm/damon: add kunit tests")
Cc: <stable@...r.kernel.org> # 5.15.x
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/tests/core-kunit.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index a2c9ee7a5de1..6e8a605277a3 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -58,7 +58,14 @@ static void damon_test_target(struct kunit *test)
 	struct damon_ctx *c = damon_new_ctx();
 	struct damon_target *t;
 
+	if (!c)
+		kunit_skip(test, "ctx alloc fail");
+
 	t = damon_new_target();
+	if (!t) {
+		damon_destroy_ctx(c);
+		kunit_skip(test, "target alloc fail");
+	}
 	KUNIT_EXPECT_EQ(test, 0u, nr_damon_targets(c));
 
 	damon_add_target(c, t);
-- 
2.47.3