[PATCH 6.12 427/567] mm/damon/tests/core-kunit: handle memory alloc failure from damon_test_aggregate()

Greg Kroah-Hartman
2026-01-06T17:39:42Z

From: SeongJae Park <sj@kernel.org>

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>
---
mm/damon/tests/core-kunit.h | 11 +++++++++++
1 file changed, 11 insertions(+)

--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -97,8 +97,15 @@ static void damon_test_aggregate(struct
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
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);