From c9342cb55661df2f61d47a68c27236604c566d9d Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Tue, 15 Jul 2025 15:15:32 +0100
Subject: [PATCH] Check for constructed name in --srv-host exceeding length
 limit.

Thanks to Mikhail Dmitrichenko for spotting this.
---
 src/option.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/option.c b/src/option.c
index 3d1157e..85dd202 100644
--- a/src/option.c
+++ b/src/option.c
@@ -6262,6 +6262,8 @@ void read_opts(int argc, char **argv, char *compile_opts)
 	    strchr(srv->name, '.') && 
 	    strchr(srv->name, '.') == strrchr(srv->name, '.'))
 	  {
+	    if (strlen(srv->name) + 1 + strlen(daemon->domain_suffix) > MAXDNAME)
+	      die(_("srv-host name %s too long after domain appended"), srv->name, EC_MISC);
 	    strcpy(buff, srv->name);
 	    strcat(buff, ".");
 	    strcat(buff, daemon->domain_suffix);