diff --git a/net/atm/clip.c b/net/atm/clip.c
index 294cb9efe3d3820046cd123caf7037eeb0dbe9c4..99a40406e78122e539ec0bc5277fc9201b980542 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -418,6 +418,8 @@ 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;