From 53419fe8bcaca1efea91b77610fef37bb77ebc86 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustavo=20I=C3=B1iguez=20Goia?= <gooffy1@gmail.com>
Date: Wed, 26 Jan 2022 21:12:16 +0100
Subject: [PATCH] rules: fixed leak/panic when parsing/loading lists

Rules of type lists [domains, IPs, network ranges] are reloaded
whenever a file containing the data changes.

One could expect to update these files once or twice a day, but
by updating the files continuously it was possible to cause a leak,
leading to a crash.
---
 daemon/rule/operator.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/daemon/rule/operator.go b/daemon/rule/operator.go
index 503e1ebd..45cbc341 100644
--- a/daemon/rule/operator.go
+++ b/daemon/rule/operator.go
@@ -233,6 +233,9 @@ func (o *Operator) reListCmp(v interface{}) bool {
 	if o.Sensitive == false {
 		dstHost = strings.ToLower(dstHost)
 	}
+	o.RLock()
+	defer o.RUnlock()
+
 	for file, re := range o.lists {
 		r := re.(*regexp.Regexp)
 		if r.MatchString(dstHost) {