--- x/net/can/j1939/transport.c
+++ y/net/can/j1939/transport.c
@@ -2122,10 +2122,12 @@ static void j1939_tp_cmd_recv(struct j19
 int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb)
 {
 	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	int ret = 1;
 
 	if (!j1939_tp_im_involved_anydir(skcb) && !j1939_cb_is_broadcast(skcb))
 		return 0;
 
+	skb_get(skb);
 	switch (skcb->addr.pgn) {
 	case J1939_ETP_PGN_DAT:
 		skcb->addr.type = J1939_ETP;
@@ -2138,14 +2140,18 @@ int j1939_tp_recv(struct j1939_priv *pri
 		skcb->addr.type = J1939_ETP;
 		fallthrough;
 	case J1939_TP_PGN_CTL:
-		if (skb->len < 8)
-			return 0; /* Don't care. Nothing to extract here */
+		if (skb->len < 8) {
+			ret = 0; /* Don't care. Nothing to extract here */
+			break;
+		}
 
 		j1939_tp_cmd_recv(priv, skb);
 		break;
 	default:
-		return 0; /* no problem */
+		ret = 0; /* no problem */
+		break;
 	}
+	kfree_skb(skb);
 	return 1; /* "I processed the message" */
 }