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

commit 8cf298c01b7fdb08eef5b6b26d0fe98d48134d72 upstream.

damon_test_update_monitoring_result() 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/20251101182021.74868-12-sj@kernel.org
Fixes: f4c978b6594b ("mm/damon/core-test: add a test for damon_update_monitoring_results()")
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>	[6.3+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 44f990462c067acddb44ecd8b8134b84e76e4aab..60226658503f92c159662610cbeb4da445295e16 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -406,6 +406,9 @@ static void damon_test_update_monitoring_result(struct kunit *test)
        struct damon_attrs new_attrs;
        struct damon_region *r = damon_new_region(3, 7);
 
+       if (!r)
+               kunit_skip(test, "region alloc fail");
+
        r->nr_accesses = 15;
        r->nr_accesses_bp = 150000;
        r->age = 20;