mm/damon/tests/core-kunit: handle alloc failures on damon_test_set_filters_default_re...

commit 84be856cc87317bc60ff54bd7c8f8a5aa8f0e2c8 upstream.

damon_test_set_filters_default_reject() 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/20251101182021.74868-17-sj@kernel.org
Fixes: 094fb14913c7 ("mm/damon/tests/core-kunit: add a test for damos_set_filters_default_reject()")
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>	[6.16+]
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 51051834e17720f24d0a832faba94a61b556447b..62e5bb465a9226214f9c22f26f7cd86a009c49d9 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -617,6 +617,8 @@ static void damon_test_set_filters_default_reject(struct kunit *test)
        KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, false);
 
        target_filter = damos_new_filter(DAMOS_FILTER_TYPE_TARGET, true, true);
+       if (!target_filter)
+               kunit_skip(test, "filter alloc fail");
        damos_add_filter(&scheme, target_filter);
        damos_set_filters_default_reject(&scheme);
        /*
@@ -642,6 +644,10 @@ static void damon_test_set_filters_default_reject(struct kunit *test)
        KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, false);
 
        anon_filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true, true);
+       if (!anon_filter) {
+               damos_free_filter(target_filter);
+               kunit_skip(test, "anon_filter alloc fail");
+       }
        damos_add_filter(&scheme, anon_filter);
 
        damos_set_filters_default_reject(&scheme);