linux-kernel - [PATCH 10/22] mm/damon/tests/core-kunit: handle alloc failures in damon_test_set

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Message-ID: <20251101182021.74868-11-sj@kernel.org>
Date: Sat,  1 Nov 2025 11:20:04 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	"# 6 . 1 . 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 10/22] mm/damon/tests/core-kunit: handle alloc failures in damon_test_set_regions()

damon_test_set_regions() 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: 62f409560eb2 ("mm/damon/core-test: test damon_set_regions")
Cc: <stable@...r.kernel.org> # 6.1.x
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/tests/core-kunit.h | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 96c8f1269f44..e38c95f86a68 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -368,13 +368,26 @@ static void damon_test_ops_registration(struct kunit *test)
 static void damon_test_set_regions(struct kunit *test)
 {
 	struct damon_target *t = damon_new_target();
-	struct damon_region *r1 = damon_new_region(4, 16);
-	struct damon_region *r2 = damon_new_region(24, 32);
+	struct damon_region *r1, *r2;
 	struct damon_addr_range range = {.start = 8, .end = 28};
 	unsigned long expects[] = {8, 16, 16, 24, 24, 28};
 	int expect_idx = 0;
 	struct damon_region *r;
 
+	if (!t)
+		kunit_skip(test, "target alloc fail");
+	r1 = damon_new_region(4, 16);
+	if (!r1) {
+		damon_free_target(t);
+		kunit_skip(test, "region alloc fail");
+	}
+	r2 = damon_new_region(24, 32);
+	if (!r2) {
+		damon_free_target(t);
+		damon_free_region(r1);
+		kunit_skip(test, "second region alloc fail");
+	}
+
 	damon_add_region(r1, t);
 	damon_add_region(r2, t);
 	damon_set_regions(t, &range, 1, DAMON_MIN_REGION);
-- 
2.47.3