cgroups: ensure that cgroup_root is initialized in legacy codepaths

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/cgroups/cgfsng.c b/src/lxc/cgroups/cgfsng.c
index eb722dc583224f501c2ad9fb563b919c22a5a187..a4c12d5cffb6e9f9797405607147f104bcefd09c 100644 (file)
--- a/src/lxc/cgroups/cgfsng.c
+++ b/src/lxc/cgroups/cgfsng.c
@@ -2143,6 +2143,9 @@ __cgfsng_ops static bool cgfsng_mount(struct cgroup_ops *ops,
                if (!cg_mount_needs_subdirs(cg_flags))
                        continue;
 
+               if (!cgroup_root)
+                       cgroup_root = must_make_path(rootfs_mnt, DEFAULT_CGROUP_MOUNTPOINT, NULL);
+
                controllerpath = must_make_path(cgroup_root, controller, NULL);
                if (dir_exists(controllerpath))
                        continue;