The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 8cf298c01b7fdb08eef5b6b26d0fe98d48134d72 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2026010505-yiddish-alienable-7ae9@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8cf298c01b7fdb08eef5b6b26d0fe98d48134d72 Mon Sep 17 00:00:00 2001 From: SeongJae Park sj@kernel.org Date: Sat, 1 Nov 2025 11:20:05 -0700 Subject: [PATCH] mm/damon/tests/core-kunit: handle alloc failures in damon_test_update_monitoring_result()

damon_test_update_monitoring_result() 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/20251101182021.74868-12-sj@kernel.org Fixes: f4c978b6594b ("mm/damon/core-test: add a test for damon_update_monitoring_results()") 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 [6.3+] Signed-off-by: Andrew Morton akpm@linux-foundation.org

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h index e38c95f86a68..10c9953581ee 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -429,6 +429,9 @@ static void damon_test_update_monitoring_result(struct kunit *test) struct damon_attrs new_attrs; struct damon_region *r = damon_new_region(3, 7);

+ if (!r) + kunit_skip(test, "region alloc fail"); + r->nr_accesses = 15; r->nr_accesses_bp = 150000; r->age = 20;