From 20797348ca9d037dc5b7a830bafdfe1ea703eac0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Tue, 13 Feb 2018 20:59:43 +0200
Subject: [PATCH] p2p/discover: fix out-of-bounds issue

---
 p2p/discover/table.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/p2p/discover/table.go b/p2p/discover/table.go
index 84c54dac1..17c9db777 100644
--- a/p2p/discover/table.go
+++ b/p2p/discover/table.go
@@ -763,7 +763,7 @@ func (tab *Table) addReplacement(b *bucket, n *Node) {
 // last entry in the bucket. If 'last' isn't the last entry, it has either been replaced
 // with someone else or became active.
 func (tab *Table) replace(b *bucket, last *Node) *Node {
-	if len(b.entries) >= 0 && b.entries[len(b.entries)-1].ID != last.ID {
+	if len(b.entries) == 0 || b.entries[len(b.entries)-1].ID != last.ID {
 		// Entry has moved, don't replace it.
 		return nil
 	}