mm/damon/tests/core-kunit: handle alloc failres in damon_test_new_filter()

commit 28ab2265e9422ccd81e4beafc0ace90f78de04c4 upstream.

damon_test_new_filter() 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/20251101182021.74868-14-sj@kernel.org
Fixes: 2a158e956b98 ("mm/damon/core-test: add a test for damos_new_filter()")
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>	[6.6+]
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 69ca44f9270bbe5e4b51b39f432123cf839a5e57..3d10a5fad5e0ca6b940efd1b19af62064cad242a 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -412,6 +412,8 @@ static void damos_test_new_filter(struct kunit *test)
        struct damos_filter *filter;
 
        filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true, false);
+       if (!filter)
+               kunit_skip(test, "filter alloc fail");
        KUNIT_EXPECT_EQ(test, filter->type, DAMOS_FILTER_TYPE_ANON);
        KUNIT_EXPECT_EQ(test, filter->matching, true);
        KUNIT_EXPECT_PTR_EQ(test, filter->list.prev, &filter->list);