From 92792f0e8bd5fc20f387f71391e5e04d7145be82 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Sun, 6 Jun 2021 01:05:14 +0200
Subject: [PATCH] Prevent remotely triggerable crash in ODoH config parser

---
 dnscrypt-proxy/odoh.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dnscrypt-proxy/odoh.go b/dnscrypt-proxy/odoh.go
index 148f0a28..9121a4d4 100644
--- a/dnscrypt-proxy/odoh.go
+++ b/dnscrypt-proxy/odoh.go
@@ -63,6 +63,9 @@ func parseODoHTargetConfig(config []byte) (ODoHTargetConfig, error) {
 }
 
 func parseODoHTargetConfigs(configs []byte) ([]ODoHTargetConfig, error) {
+	if len(configs) <= 2 {
+		return nil, fmt.Errorf("No configs")
+	}
 	length := binary.BigEndian.Uint16(configs)
 	if len(configs) != int(length)+2 {
 		return nil, fmt.Errorf("Malformed configs")