6.6-stable review patch. If anyone has any objections, please let me know.
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From: SeongJae Park sj@kernel.org
commit e16fdd4f754048d6e23c56bd8d920b71e41e3777 upstream.
damon_test_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/20251101182021.74868-3-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/core-test.h | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/mm/damon/core-test.h +++ b/mm/damon/core-test.h @@ -20,11 +20,17 @@ static void damon_test_regions(struct ku struct damon_target *t;
r = damon_new_region(1, 2); + if (!r) + kunit_skip(test, "region alloc fail"); KUNIT_EXPECT_EQ(test, 1ul, r->ar.start); KUNIT_EXPECT_EQ(test, 2ul, r->ar.end); KUNIT_EXPECT_EQ(test, 0u, r->nr_accesses);
t = damon_new_target(); + if (!t) { + damon_free_region(r); + kunit_skip(test, "target alloc fail"); + } KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t));
damon_add_region(r, t);