mm/damon/tests/core-kunit: handle alloc failures on dasmon_test_merge_regions_of()

commit 0998d2757218771c59d5ca59ccf13d1542a38f17 upstream.

damon_test_merge_regions_of() 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/20251101182021.74868-8-sj@kernel.org
Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests")
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>	[5.15+]
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 948b1b4ab1685d48fcaff89f7f70339c81c45cf1..f00edabc5ddbb3257ee27221877d9458d6fd4a07 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -238,8 +238,14 @@ static void damon_test_merge_regions_of(struct kunit *test)
        int i;
 
        t = damon_new_target();
+       if (!t)
+               kunit_skip(test, "target alloc fail");
        for (i = 0; i < ARRAY_SIZE(sa); i++) {
                r = damon_new_region(sa[i], ea[i]);
+               if (!r) {
+                       damon_free_target(t);
+                       kunit_skip(test, "region alloc fail");
+               }
                r->nr_accesses = nrs[i];
                r->nr_accesses_bp = nrs[i] * 10000;
                damon_add_region(r, t);