Bluetooth: L2CAP: Fix handling LE modes by L2CAP_OPTIONS

commit b86b0b1 upstream.

L2CAP_OPTIONS shall only be used with BR/EDR modes.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Zubin Mithra <zsm@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/bluetooth/l2cap_sock.c

@@ -426,6 +426,20 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
 			break;
 		}
 
+		/* Only BR/EDR modes are supported here */
+		switch (chan->mode) {
+		case L2CAP_MODE_BASIC:
+		case L2CAP_MODE_ERTM:
+		case L2CAP_MODE_STREAMING:
+			break;
+		default:
+			err = -EINVAL;
+			break;
+		}
+
+		if (err < 0)
+			break;
+
 		memset(&opts, 0, sizeof(opts));
 		opts.imtu     = chan->imtu;
 		opts.omtu     = chan->omtu;
@@ -685,10 +699,8 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
 			break;
 		}
 
-		chan->mode = opts.mode;
-		switch (chan->mode) {
-		case L2CAP_MODE_LE_FLOWCTL:
-			break;
+		/* Only BR/EDR modes are supported here */
+		switch (opts.mode) {
 		case L2CAP_MODE_BASIC:
 			clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
 			break;
@@ -702,6 +714,10 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
 			break;
 		}
 
+		if (err < 0)
+			break;
+
+		chan->mode = opts.mode;
 		chan->imtu = opts.imtu;
 		chan->omtu = opts.omtu;
 		chan->fcs  = opts.fcs;