diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index ce669f2757f7f3..12cbc988f4fb85 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -928,6 +928,9 @@ static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
 	if (size > llc->dev->mtu)
 		size = llc->dev->mtu;
 	copied = size - hdrlen;
+	rc = -EINVAL;
+	if (copied < 0)
+		goto release;
 	release_sock(sk);
 	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
 	lock_sock(sk);