cgroup.go: avoid panic on nil interface

Signed-off-by: linrunlong <[email protected]>
containerd · Sep 8, 2021 · 6aeb1eb · 6aeb1eb
1 parent ddda8a1
commit 6aeb1eb
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/cgroup.go b/cgroup.go
@@ -323,6 +323,9 @@ func (c *cgroup) Tasks(subsystem Name, recursive bool) ([]Task, error) {
 
 func (c *cgroup) processes(subsystem Name, recursive bool, pType procType) ([]Process, error) {
 	s := c.getSubsystem(subsystem)
+	if s == nil {
+		return nil, ErrControllerNotActive
+	}
 	sp, err := c.path(subsystem)
 	if err != nil {
 		return nil, err