mm/damon/tests/core-kunit: handle memory alloc failure from damon_test_aggregate()

commit f79f2fc44ebd0ed655239046be3e80e8804b5545 upstream.

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.

Link: https://lkml.kernel.org/r/20251101182021.74868-5-sj@kernel.org
Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests")
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>	[5.15+]
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 0fe5bb5808f2f09d60e04d252121b5be81429afc..2fc66d1a0d27cd05aa1727a1e51afa3faa68f037 100644 (file)
--- 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);