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

commit fafe953de2c661907c94055a2497c6b8dbfd26f3 upstream.

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>
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 22d5ff51fa0b9145870b3dc9db2ed5d2ea88fe7a..fb42763e4cf185b779717c1a9b8171191b9a665a 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);