mm/damon/tests/core-kunit: handle alloc failure on damos_test_commit_filter()

damon_test_commit_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/20251101182021.74868-15-sj@kernel.org
Fixes: f6a4a150f1ec ("mm/damon/tests/core-kunit: add damos_commit_filter test")
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>	[6.18+]
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 03c7ac31db5cff9de010978c2feeb8031b04c847..5af8275ffd7dd89b6eff058f25f844281fc7d0e6 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -516,11 +516,16 @@ static void damos_test_new_filter(struct kunit *test)
 
 static void damos_test_commit_filter(struct kunit *test)
 {
-       struct damos_filter *src_filter = damos_new_filter(
-               DAMOS_FILTER_TYPE_ANON, true, true);
-       struct damos_filter *dst_filter = damos_new_filter(
-               DAMOS_FILTER_TYPE_ACTIVE, false, false);
-
+       struct damos_filter *src_filter, *dst_filter;
+
+       src_filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true, true);
+       if (!src_filter)
+               kunit_skip(test, "src filter alloc fail");
+       dst_filter = damos_new_filter(DAMOS_FILTER_TYPE_ACTIVE, false, false);
+       if (!dst_filter) {
+               damos_destroy_filter(src_filter);
+               kunit_skip(test, "dst filter alloc fail");
+       }
        damos_commit_filter(dst_filter, src_filter);
        KUNIT_EXPECT_EQ(test, dst_filter->type, src_filter->type);
        KUNIT_EXPECT_EQ(test, dst_filter->matching, src_filter->matching);