diff --git a/net/atm/clip.c b/net/atm/clip.c
index d795b9c5aea4a4e35021d9db2e10254036df55fe..16d98bdef5990f43d1538d2abfa779af56648359 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -417,6 +417,8 @@ static int clip_mkip(struct atm_vcc *vcc, int timeout)
 
 	if (!vcc->push)
 		return -EBADFD;
+	if (vcc->user_back)
+		return -EINVAL;
 	clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
 	if (!clip_vcc)
 		return -ENOMEM;