Check for empty message in typify

middleware/pkg/response/typify.go

@@ -58,6 +58,10 @@ func TypeFromString(s string) (Type, error) {
 
 // Typify classifies a message, it returns the Type.
 func Typify(m *dns.Msg) (Type, *dns.OPT) {
+	if m == nil {
+		return OtherError, nil
+	}
+
 	opt := m.IsEdns0()
 
 	if len(m.Answer) > 0 && m.Rcode == dns.RcodeSuccess {

middleware/pkg/response/typify_test.go

@@ -8,6 +8,15 @@ import (
 	"github.com/miekg/dns"
 )
 
+func TestTypifyNilMsg(t *testing.T) {
+	var m *dns.Msg = nil
+
+	ty, _ := Typify(m)
+	if ty != OtherError {
+		t.Errorf("message wrongly typified, expected OtherError, got %d", ty)
+	}
+}
+
 func TestClassifyDelegation(t *testing.T) {
 	m := delegationMsg()
 	mt, _ := Typify(m)