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: SeongJae Park <sj@kernel.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 a93761c1bc92b295cb1bdaa667c3f91cdb02c4c0..d7737f5df6688ac67fd8412e9ffa1465426fcb8b 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -505,6 +505,8 @@ static void damos_test_new_filter(struct kunit *test)
        struct damos_filter *filter;
 
        filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true);
+       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);