From e117244850527e51c6ea06167deb76222ef59e8b Mon Sep 17 00:00:00 2001 From: Evan Hunt Date: Fri, 13 May 2022 19:59:58 -0700 Subject: [PATCH] prevent a possible buffer overflow in configuration check corrected code that could have allowed a buffer overfow while parsing named.conf. (cherry picked from commit 921043b54161c7a3e6dc4036b038ca4dbc5fe472) --- lib/bind9/check.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/bind9/check.c b/lib/bind9/check.c index 1017468d42..9c98c528d9 100644 --- a/lib/bind9/check.c +++ b/lib/bind9/check.c @@ -3011,8 +3011,8 @@ check_zoneconf(const cfg_obj_t *zconfig, const cfg_obj_t *voptions, } else if (dns_name_isula(zname)) { ula = true; } - tmp += strlen(tmp); len -= strlen(tmp); + tmp += strlen(tmp); (void)snprintf(tmp, len, "%u/%s", zclass, (ztype == CFG_ZONE_INVIEW) ? target : (viewname != NULL) ? viewname @@ -3721,8 +3721,8 @@ check_zoneconf(const cfg_obj_t *zconfig, const cfg_obj_t *voptions, char *tmp = keydirbuf; size_t len = sizeof(keydirbuf); dns_name_format(zname, keydirbuf, sizeof(keydirbuf)); - tmp += strlen(tmp); len -= strlen(tmp); + tmp += strlen(tmp); (void)snprintf(tmp, len, "/%s", (dir == NULL) ? "(null)" : dir); tresult = keydirexist(zconfig, (const char *)keydirbuf, kaspname, keydirs, logctx, mctx);