From c09544f29de389dceb432b05c5ce0e5a62468431 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Tue, 12 Nov 2024 10:30:18 +0800
Subject: [PATCH] stack: Fix close before start

---
 stack_gvisor.go | 3 +++
 stack_mixed.go  | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/stack_gvisor.go b/stack_gvisor.go
index 795d963..792c461 100644
--- a/stack_gvisor.go
+++ b/stack_gvisor.go
@@ -152,6 +152,9 @@ func (t *GVisor) Start() error {
 }
 
 func (t *GVisor) Close() error {
+	if t.stack == nil {
+		return nil
+	}
 	t.endpoint.Attach(nil)
 	t.stack.Close()
 	for _, endpoint := range t.stack.CleanupEndpoints() {
diff --git a/stack_mixed.go b/stack_mixed.go
index c1abbb7..d2683cc 100644
--- a/stack_mixed.go
+++ b/stack_mixed.go
@@ -260,6 +260,9 @@ func (m *Mixed) packetLoop() {
 }
 
 func (m *Mixed) Close() error {
+	if m.stack == nil {
+		return nil
+	}
 	m.endpoint.Attach(nil)
 	m.stack.Close()
 	for _, endpoint := range m.stack.CleanupEndpoints() {