resolved: explicitly refuse adding invalid DNS names to DNS packets

Fixes: #33671

diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 2684944b75ef2417285aa7b5d0b69828b7567473..c414ca800c3c623ca42ccbd2c2fc27aa6fe0f96c 100644 (file)
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -564,6 +564,12 @@ int dns_packet_append_name(
         assert(p);
         assert(name);
 
+        r = dns_name_is_valid(name);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return -EINVAL;
+
         if (p->refuse_compression)
                 allow_compression = false;