From 80ee994727041a1f723809a63f617274285edf7d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Thu, 22 Sep 2022 16:33:25 +0800
Subject: [PATCH] Fix system ipv4 overflow

---
 internal/clashtcpip/ip.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/clashtcpip/ip.go b/internal/clashtcpip/ip.go
index ad65679..598656f 100644
--- a/internal/clashtcpip/ip.go
+++ b/internal/clashtcpip/ip.go
@@ -173,7 +173,7 @@ func (p IPv4Packet) PseudoSum() uint32 {
 }
 
 func (p IPv4Packet) Valid() bool {
-	return len(p) >= IPv4HeaderSize && uint16(len(p)) >= p.TotalLen()
+	return len(p) >= IPv4HeaderSize && p.TotalLen() >= p.HeaderLen() && uint16(len(p)) >= p.TotalLen()
 }
 
 func (p IPv4Packet) Verify() error {