diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 4415eb4..c2fb26d 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1430,6 +1430,8 @@
 	tx_skb = skb_clone(skb, GFP_ATOMIC);
 	bt_cb(skb)->retries++;
 	control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
+	control &= L2CAP_CTRL_SAR;
+
 	control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
 			| (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
 	put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
@@ -1465,6 +1467,8 @@
 		bt_cb(skb)->retries++;
 
 		control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
+		control &= L2CAP_CTRL_SAR;
+
 		if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
 			control |= L2CAP_CTRL_FINAL;
 			pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;