[PATCH v3 1/3] mm/damon/sysfs: fix param_ctx leak on damon_sysfs_new_test_ctx() failure

SeongJae Park
2026-03-21T17:54:36Z

From: Josh Law <objecting@objecting.org>

When damon_sysfs_new_test_ctx() fails in damon_sysfs_commit_input(),
param_ctx is leaked because the early return skips the cleanup at the
out label. Destroy param_ctx before returning.

Fixes: f0c5118ebb0e ("mm/damon/sysfs: catch commit test ctx alloc failure")
Cc: <stable@vger.kernel.org> # 6.18.x
Signed-off-by: Josh Law <objecting@objecting.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
---
mm/damon/sysfs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 576d1ddd736bf..b573b9d607848 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1524,8 +1524,10 @@ static int damon_sysfs_commit_input(void *data)
if (IS_ERR(param_ctx))
return PTR_ERR(param_ctx);
test_ctx = damon_sysfs_new_test_ctx(kdamond->damon_ctx);
- if (!test_ctx)
+ if (!test_ctx) {
+ damon_destroy_ctx(param_ctx);
return -ENOMEM;
+ }
err = damon_commit_ctx(test_ctx, param_ctx);
if (err)
goto out;
--
2.47.3