From: Matthijs Mekking <matthijs@isc.org>
Date: Thu, 2 Apr 2026 08:21:24 +0000 (+0200)
Subject: Fix buffer overflow in check_zoneconf
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51975b54347db4c8662e771b44a967edeabea239;p=thirdparty%2Fbind9.git

Fix buffer overflow in check_zoneconf

Removing these two lines prevents the buffer overflow at startup.
---

diff --git a/lib/bind9/check.c b/lib/bind9/check.c
index b562869a183..38602496102 100644
--- a/lib/bind9/check.c
+++ b/lib/bind9/check.c
@@ -1999,8 +1999,6 @@ check_zoneconf(const cfg_obj_t *zconfig, const cfg_obj_t *voptions,
 			rfc1918 = true;
 		else if (dns_name_isula(zname))
 			ula = true;
-		tmp += strlen(tmp);
-		len -= strlen(tmp);
 		(void)snprintf(tmp, len, "%u/%s", zclass,
 			       (ztype == CFG_ZONE_INVIEW) ? target :
 				(viewname != NULL) ? viewname : "_default");