mm/damon/tests/core-kunit: handle alloc failures in damon_test_ops_registration()

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>

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 10618cdd188ee6a584827b1225e2655676abfd4f..96c8f1269f44bd90ba40cd32575df36a9aa12c68 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -320,6 +320,9 @@ static void damon_test_ops_registration(struct kunit *test)
        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;