6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: SeongJae Park sj@kernel.org
commit 2b22d0fcc6320ba29b2122434c1d2f0785fb0a25 upstream.
damon_do_test_apply_three_regions() 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/20251101182021.74868-18-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: SeongJae Park sj@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/damon/vaddr-test.h | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/mm/damon/vaddr-test.h +++ b/mm/damon/vaddr-test.h @@ -136,8 +136,14 @@ static void damon_do_test_apply_three_re int i;
t = damon_new_target(); + if (!t) + kunit_skip(test, "target alloc fail"); for (i = 0; i < nr_regions / 2; i++) { r = damon_new_region(regions[i * 2], regions[i * 2 + 1]); + if (!r) { + damon_destroy_target(t); + kunit_skip(test, "region alloc fail"); + } damon_add_region(r, t); }