[PATCH 04/22] mm/damon/tests/core-kunit: handle memory alloc failure from damon_test_aggregate()

[SeongJae Park]

damon_test_aggregate() 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.

Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests")
Cc: <sta...@vger.kernel.org> # 5.15.x
Signed-off-by: SeongJae Park <s...@kernel.org>
---
 mm/damon/tests/core-kunit.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 6e8a605277a3..fd1e1ecaa2c9 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -97,8 +97,15 @@ static void damon_test_aggregate(struct kunit *test)
        struct damon_region *r;
        int it, ir;
 
+       if (!ctx)
+               kunit_skip(test, "ctx alloc fail");
+
        for (it = 0; it < 3; it++) {
                t = damon_new_target();
+               if (!t) {
+                       damon_destroy_ctx(ctx);
+                       kunit_skip(test, "target alloc fail");
+               }
                damon_add_target(ctx, t);
        }
 
@@ -106,6 +113,10 @@ static void damon_test_aggregate(struct kunit *test)
        damon_for_each_target(t, ctx) {
                for (ir = 0; ir < 3; ir++) {
                        r = damon_new_region(saddr[it][ir], eaddr[it][ir]);
+                       if (!r) {
+                               damon_destroy_ctx(ctx);
+                               kunit_skip(test, "region alloc fail");
+                       }
                        r->nr_accesses = accesses[it][ir];
                        r->nr_accesses_bp = accesses[it][ir] * 10000;
                        damon_add_region(r, t);
-- 
2.47.3