linux-kernel - [PATCH 05/22] mm/damon/tests/core-kunit: handle alloc failures on damon_test_split

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Message-ID: <20251101182021.74868-6-sj@kernel.org>
Date: Sat,  1 Nov 2025 11:19:59 -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 05/22] mm/damon/tests/core-kunit: handle alloc failures on damon_test_split_at()

damon_test_split_at() 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 | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index fd1e1ecaa2c9..f5f3152cb8df 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -148,8 +148,19 @@ static void damon_test_split_at(struct kunit *test)
 	struct damon_target *t;
 	struct damon_region *r, *r_new;
 
+	if (!c)
+		kunit_skip(test, "ctx alloc fail");
 	t = damon_new_target();
+	if (!t) {
+		damon_destroy_ctx(c);
+		kunit_skip(test, "target alloc fail");
+	}
 	r = damon_new_region(0, 100);
+	if (!r) {
+		damon_destroy_ctx(c);
+		damon_free_target(t);
+		kunit_skip(test, "region alloc fail");
+	}
 	r->nr_accesses_bp = 420000;
 	r->nr_accesses = 42;
 	r->last_nr_accesses = 15;
-- 
2.47.3