[PATCH 1/2] mm/damon/core: fix new damon_target objects leaks on damon_commit_targets()

[SeongJae Park <sj@kernel.org>]

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.

Fixes: 9cb3d0b9dfce ("mm/damon/core: implement DAMON context commit function")
Cc: <stable@vger.kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
---
 mm/damon/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index a71703e05300..931e8e4b1333 100644
--- a/mm/damon/core.c
+++ b/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;
 }
-- 
2.39.5