The patch titled Subject: mm/damon/core: fix new damon_target objects leaks on damon_commit_targets() has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-damon-core-fix-new-damon_target-objects-leaks-on-damon_commit_targets.patch
This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...
This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: SeongJae Park sj@kernel.org Subject: mm/damon/core: fix new damon_target objects leaks on damon_commit_targets() Date: Sun, 22 Dec 2024 15:12:21 -0800
Patch series "mm/damon/core: fix memory leaks and ignored inputs from damon_commit_ctx()".
Due to two bugs in damon_commit_targets() and damon_commit_schemes(), which are called from damon_commit_ctx(), some user inputs can be ignored, and some mmeory objects can be leaked. Fix those.
Note that only DAMON sysfs interface users are affected. Other DAMON core API user modules that more focused more on simple and dedicated production usages, including DAMON_RECLAIM and DAMON_LRU_SORT are not using the buggy function in the way, so not affected.
This patch (of 2):
When new DAMON targets are added via damon_commit_targets(), the newly created targets are not deallocated when updating the internal data (damon_commit_target()) is failed. Worse yet, even if the setup is successfully done, the new target is not linked to the context. Hence, the new targets are always leaked regardless of the internal data setup failure. Fix the leaks.
Link: https://lkml.kernel.org/r/20241222231222.85060-2-sj@kernel.org Fixes: 9cb3d0b9dfce ("mm/damon/core: implement DAMON context commit function") Signed-off-by: SeongJae Park sj@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/damon/core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/mm/damon/core.c~mm-damon-core-fix-new-damon_target-objects-leaks-on-damon_commit_targets +++ a/mm/damon/core.c @@ -961,8 +961,11 @@ static int damon_commit_targets( return -ENOMEM; err = damon_commit_target(new_target, false, src_target, damon_target_has_pid(src)); - if (err) + if (err) { + damon_destroy_target(new_target); return err; + } + damon_add_target(dst, new_target); } return 0; } _
Patches currently in -mm which might be from sj@kernel.org are
mm-damon-core-fix-new-damon_target-objects-leaks-on-damon_commit_targets.patch mm-damon-core-fix-ignored-quota-goals-and-filters-of-newly-committed-schemes.patch samples-add-a-skeleton-of-a-sample-damon-module-for-working-set-size-estimation.patch samples-damon-wsse-start-and-stop-damon-as-the-user-requests.patch samples-damon-wsse-implement-working-set-size-estimation-and-logging.patch samples-damon-introduce-a-skeleton-of-a-smaple-damon-module-for-proactive-reclamation.patch samples-damon-prcl-implement-schemes-setup.patch replace-free-hugepage-folios-after-migration-fix-2.patch