diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index d6bc5f2a1175ff..85aae8c84aebe7 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -926,6 +926,9 @@ static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 	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);