[PATCH 6.12 432/567] mm/damon/tests/core-kunit: handle alloc failures in damon_test_ops_registration()

Greg Kroah-Hartman
2026-01-06T17:38:06Z

From: SeongJae Park <sj@kernel.org>

commit 4f835f4e8c863985f15abd69db033c2f66546094 upstream.

damon_test_ops_registration() 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.

Link: https://lkml.kernel.org/r/20251101182021.74868-10-sj@kernel.org
Fixes: 4f540f5ab4f2 ("mm/damon/core-test: add a kunit test case for ops registration")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <stable@vger.kernel.org> [5.19+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
mm/damon/tests/core-kunit.h | 3 +++
1 file changed, 3 insertions(+)

--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -300,6 +300,9 @@ static void damon_test_ops_registration(
struct damon_operations ops = {.id = DAMON_OPS_VADDR}, bak;
bool need_cleanup = false;

+ if (!c)
+ kunit_skip(test, "ctx alloc fail");
+
/* DAMON_OPS_VADDR is registered only if CONFIG_DAMON_VADDR is set */
if (!damon_is_registered_ops(DAMON_OPS_VADDR)) {
bak.id = DAMON_OPS_VADDR;