Fix undefined cname race condition

Co-authored-by: Jan Dubois <[email protected]>

Author: dee-kryvenko

pkg/hostagent/dns.go

@@ -76,7 +76,10 @@ func (h *Handler) handleQuery(w dns.ResponseWriter, req *dns.Msg) {
 		switch q.Qtype {
 		case dns.TypeCNAME, dns.TypeA, dns.TypeAAAA:
 			cname, err := net.LookupCNAME(q.Name)
-			if err == nil && cname != "" && cname != q.Name {
+			if err != nil {
+				break
+			}
+			if cname != "" && cname != q.Name {
 				hdr.Rrtype = dns.TypeCNAME
 				a := &dns.CNAME{
 					Hdr:    hdr,