From 11c769b3c783b6365a7fc0d79c61b0c2d01aa9e1 Mon Sep 17 00:00:00 2001
From: 6543 <6543@obermui.de>
Date: Sun, 24 Apr 2022 21:43:23 +0200
Subject: [PATCH] use IsLoopback

---
 modules/validation/helpers.go | 24 +-----------------------
 1 file changed, 1 insertion(+), 23 deletions(-)

diff --git a/modules/validation/helpers.go b/modules/validation/helpers.go
index 617ec3578c8f9..484b12b2a23c4 100644
--- a/modules/validation/helpers.go
+++ b/modules/validation/helpers.go
@@ -13,32 +13,10 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 )
 
-var loopbackIPBlocks []*net.IPNet
-
 var externalTrackerRegex = regexp.MustCompile(`({?)(?:user|repo|index)+?(}?)`)
 
-func init() {
-	for _, cidr := range []string{
-		"127.0.0.0/8", // IPv4 loopback
-		"::1/128",     // IPv6 loopback
-	} {
-		if _, block, err := net.ParseCIDR(cidr); err == nil {
-			loopbackIPBlocks = append(loopbackIPBlocks, block)
-		}
-	}
-}
-
 func isLoopbackIP(ip string) bool {
-	pip := net.ParseIP(ip)
-	if pip == nil {
-		return false
-	}
-	for _, block := range loopbackIPBlocks {
-		if block.Contains(pip) {
-			return true
-		}
-	}
-	return false
+	return net.ParseIP(ip).IsLoopback()
 }
 
 // IsValidURL checks if URL is valid