From 436faf34e1c49fabe6aa3991b82ef1e827cffec9 Mon Sep 17 00:00:00 2001
From: wgr523 <wgr523@gmail.com>
Date: Sun, 26 Mar 2023 19:54:56 +0800
Subject: [PATCH] Fix of discreason type problem (#242)

Problem: https://github.com/advisories/GHSA-wjxw-gh3m-7pm5

Fix: add non-negative `if` condition.

cannot use fix in geth (https://github.com/ethereum/go-ethereum/pull/24507) since modifying DiscReason to uint8 messes up the message encode
---
 p2p/peer_error.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/p2p/peer_error.go b/p2p/peer_error.go
index 544d42315b..64530116e6 100644
--- a/p2p/peer_error.go
+++ b/p2p/peer_error.go
@@ -93,10 +93,10 @@ var discReasonToString = [...]string{
 }
 
 func (d DiscReason) String() string {
-	if len(discReasonToString) < int(d) {
+	if len(discReasonToString) <= int(d) || int(d) < 0 {
 		return fmt.Sprintf("unknown disconnect reason %d", d)
 	}
-	return discReasonToString[d]
+	return discReasonToString[int(d)]
 }
 
 func (d DiscReason) Error() string {