From f318e573d4a65f7c2b80d81beeceba8b86dd996a Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Wed, 7 Oct 2020 18:27:24 +0300
Subject: [PATCH] payload: limit the user agent field in version payload

Protocol limit.
---
 pkg/network/payload/version.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkg/network/payload/version.go b/pkg/network/payload/version.go
index 6bb3bcdc1..dee8650a1 100644
--- a/pkg/network/payload/version.go
+++ b/pkg/network/payload/version.go
@@ -8,6 +8,9 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/network/capability"
 )
 
+// MaxUserAgentLength is the limit for user agent field.
+const MaxUserAgentLength = 1024
+
 // Version payload.
 type Version struct {
 	// NetMode of the node
@@ -42,7 +45,7 @@ func (p *Version) DecodeBinary(br *io.BinReader) {
 	p.Version = br.ReadU32LE()
 	p.Timestamp = br.ReadU32LE()
 	p.Nonce = br.ReadU32LE()
-	p.UserAgent = br.ReadVarBytes()
+	p.UserAgent = br.ReadVarBytes(MaxUserAgentLength)
 	p.Capabilities.DecodeBinary(br)
 }