diff --git a/net/atm/signaling.c b/net/atm/signaling.c
index e70ae2c113f9..0fda16975c70 100644
--- a/net/atm/signaling.c
+++ b/net/atm/signaling.c
@@ -63,6 +63,11 @@ static void modify_qos(struct atm_vcc *vcc, struct atmsvc_msg *msg)
 
 static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
 {
+	if (vcc != sigd || !test_bit(ATM_VF_SESSION, &vcc->flags)) {
+		dev_kfree_skb(skb);
+		return -EPERM;
+	}
+
 	struct atmsvc_msg *msg;
 	struct atm_vcc *session_vcc;
 	struct sock *sk;