[PATCH 2/2] nsfs: fix namespace reference leak on unsupported ns_type in nsfs_fh_to_dentry()

[Hui Peng <benquike@gmail.com>]

In nsfs_fh_to_dentry(), ns_get_unless_inactive(ns) acquires an active
reference to ns before switching on ns->ns_type. Unlike the CLONE_NEWPID
error path and the owning_ns permission error path, the default: branch
returns ERR_PTR(-EOPNOTSUPP) without calling ns->ops->put(ns), leaking
the namespace reference.

Call ns->ops->put(ns) before returning ERR_PTR(-EOPNOTSUPP) in the
default: branch.

Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
---
 fs/nsfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nsfs.c b/fs/nsfs.c
index a1842e12f..e9cc09583 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -624,6 +624,7 @@
 		break;
 #endif
 	default:
+		ns->ops->put(ns);
 		return ERR_PTR(-EOPNOTSUPP);
 	}
 
-- 
2.43.0