damon_test_split_regions_of() 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/20251101182021.74868-9-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 (cherry picked from commit eded254cb69044bd4abde87394ea44909708d7c0) Signed-off-by: SeongJae Park sj@kernel.org --- mm/damon/core-test.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h index 7008c3735e99..5741d08bfe0e 100644 --- a/mm/damon/core-test.h +++ b/mm/damon/core-test.h @@ -215,15 +215,36 @@ static void damon_test_split_regions_of(struct kunit *test) struct damon_target *t; struct damon_region *r;
+ if (!c) + kunit_skip(test, "ctx alloc fail"); + t = damon_new_target(42); + if (!t) { + damon_destroy_ctx(c); + kunit_skip(test, "target alloc fail"); + } r = damon_new_region(0, 22); + if (!r) { + damon_destroy_ctx(c); + damon_free_target(t); + kunit_skip(test, "region alloc fail"); + } damon_add_region(r, t); damon_split_regions_of(c, t, 2); KUNIT_EXPECT_LE(test, damon_nr_regions(t), 2u); damon_free_target(t);
t = damon_new_target(42); + if (!t) { + damon_destroy_ctx(c); + kunit_skip(test, "second target alloc fail"); + } r = damon_new_region(0, 220); + if (!r) { + damon_destroy_ctx(c); + damon_free_target(t); + kunit_skip(test, "second region alloc fail"); + } damon_add_region(r, t); damon_split_regions_of(c, t, 4); KUNIT_EXPECT_LE(test, damon_nr_regions(t), 4u);