mm/damon/tests/core-kunit: handle memory failure from damon_test_target()

damon_test_target() 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/20251101182021.74868-4-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>

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index a2c9ee7a5de1a7af39d2dd8ed2f7c1ffe773d1d0..6e8a605277a314f8071162d825cbf748a8038000 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -58,7 +58,14 @@ static void damon_test_target(struct kunit *test)
        struct damon_ctx *c = damon_new_ctx();
        struct damon_target *t;
 
+       if (!c)
+               kunit_skip(test, "ctx alloc fail");
+
        t = damon_new_target();
+       if (!t) {
+               damon_destroy_ctx(c);
+               kunit_skip(test, "target alloc fail");
+       }
        KUNIT_EXPECT_EQ(test, 0u, nr_damon_targets(c));
 
        damon_add_target(c, t);