[PATCH 6.1 237/303] Bluetooth: MGMT: Fix not generating command complete for MGMT_OP_DISCONNECT

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Luiz Augusto von Dentz <[email protected]>

[ Upstream commit 227a0cdf4a028a73dc256d0f5144b4808d718893 ]

MGMT_OP_DISCONNECT can be called while mgmt_device_connected has not
been called yet, which will cause the connection procedure to be
aborted, so mgmt_device_disconnected shall still respond with command
complete to MGMT_OP_DISCONNECT and just not emit
MGMT_EV_DEVICE_DISCONNECTED since MGMT_EV_DEVICE_CONNECTED was never
sent.

To fix this MGMT_OP_DISCONNECT is changed to work similarly to other
command which do use hci_cmd_sync_queue and then use hci_conn_abort to
disconnect and returns the result, in order for hci_conn_abort to be
used from hci_cmd_sync context it now uses hci_cmd_sync_run_once.

Link: https://github.com/bluez/bluez/issues/932
Fixes: 12d4a3b2ccb3 ("Bluetooth: Move check for MGMT_CONNECTED flag into mgmt.c")
Signed-off-by: Luiz Augusto von Dentz <[email protected]>
Stable-dep-of: d0a7b48ad092 ("Bluetooth: mgmt: fix UAF in pair command cancellation")
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 net/bluetooth/mgmt.c |   84 +++++++++++++++++++++++++--------------------------
 1 file changed, 42 insertions(+), 42 deletions(-)

--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2956,7 +2956,12 @@ static int unpair_device_sync(struct hci
 	if (!conn)
 		return 0;
 
-	return hci_abort_conn_sync(hdev, conn, HCI_ERROR_REMOTE_USER_TERM);
+	/* Disregard any possible error since the likes of hci_abort_conn_sync
+	 * will clean up the connection no matter the error.
+	 */
+	hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
+
+	return 0;
 }
 
 static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data,
@@ -3088,13 +3093,44 @@ unlock:
 	return err;
 }
 
+static void disconnect_complete(struct hci_dev *hdev, void *data, int err)
+{
+	struct mgmt_pending_cmd *cmd = data;
+
+	cmd->cmd_complete(cmd, mgmt_status(err));
+	mgmt_pending_free(cmd);
+}
+
+static int disconnect_sync(struct hci_dev *hdev, void *data)
+{
+	struct mgmt_pending_cmd *cmd = data;
+	struct mgmt_cp_disconnect *cp = cmd->param;
+	struct hci_conn *conn;
+
+	if (cp->addr.type == BDADDR_BREDR)
+		conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK,
+					       &cp->addr.bdaddr);
+	else
+		conn = hci_conn_hash_lookup_le(hdev, &cp->addr.bdaddr,
+					       le_addr_type(cp->addr.type));
+
+	if (!conn)
+		return -ENOTCONN;
+
+	/* Disregard any possible error since the likes of hci_abort_conn_sync
+	 * will clean up the connection no matter the error.
+	 */
+	hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
+
+	return 0;
+}
+
 static int disconnect(struct sock *sk, struct hci_dev *hdev, void *data,
 		      u16 len)
 {
 	struct mgmt_cp_disconnect *cp = data;
 	struct mgmt_rp_disconnect rp;
 	struct mgmt_pending_cmd *cmd;
-	struct hci_conn *conn;
 	int err;
 
 	bt_dev_dbg(hdev, "sock %p", sk);
@@ -3117,27 +3153,7 @@ static int disconnect(struct sock *sk, s
 		goto failed;
 	}
 
-	if (pending_find(MGMT_OP_DISCONNECT, hdev)) {
-		err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_DISCONNECT,
-					MGMT_STATUS_BUSY, &rp, sizeof(rp));
-		goto failed;
-	}
-
-	if (cp->addr.type == BDADDR_BREDR)
-		conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK,
-					       &cp->addr.bdaddr);
-	else
-		conn = hci_conn_hash_lookup_le(hdev, &cp->addr.bdaddr,
-					       le_addr_type(cp->addr.type));
-
-	if (!conn || conn->state == BT_OPEN || conn->state == BT_CLOSED) {
-		err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_DISCONNECT,
-					MGMT_STATUS_NOT_CONNECTED, &rp,
-					sizeof(rp));
-		goto failed;
-	}
-
-	cmd = mgmt_pending_add(sk, MGMT_OP_DISCONNECT, hdev, data, len);
+	cmd = mgmt_pending_new(sk, MGMT_OP_DISCONNECT, hdev, data, len);
 	if (!cmd) {
 		err = -ENOMEM;
 		goto failed;
@@ -3145,9 +3161,10 @@ static int disconnect(struct sock *sk, s
 
 	cmd->cmd_complete = generic_cmd_complete;
 
-	err = hci_disconnect(conn, HCI_ERROR_REMOTE_USER_TERM);
+	err = hci_cmd_sync_queue(hdev, disconnect_sync, cmd,
+				 disconnect_complete);
 	if (err < 0)
-		mgmt_pending_remove(cmd);
+		mgmt_pending_free(cmd);
 
 failed:
 	hci_dev_unlock(hdev);
@@ -9695,18 +9712,6 @@ void mgmt_device_connected(struct hci_de
 	mgmt_event_skb(skb, NULL);
 }
 
-static void disconnect_rsp(struct mgmt_pending_cmd *cmd, void *data)
-{
-	struct sock **sk = data;
-
-	cmd->cmd_complete(cmd, 0);
-
-	*sk = cmd->sk;
-	sock_hold(*sk);
-
-	mgmt_pending_remove(cmd);
-}
-
 static void unpair_device_rsp(struct mgmt_pending_cmd *cmd, void *data)
 {
 	struct hci_dev *hdev = data;
@@ -9747,8 +9752,6 @@ void mgmt_device_disconnected(struct hci
 	if (link_type != ACL_LINK && link_type != LE_LINK)
 		return;
 
-	mgmt_pending_foreach(MGMT_OP_DISCONNECT, hdev, disconnect_rsp, &sk);
-
 	bacpy(&ev.addr.bdaddr, bdaddr);
 	ev.addr.type = link_to_bdaddr(link_type, addr_type);
 	ev.reason = reason;
@@ -9761,9 +9764,6 @@ void mgmt_device_disconnected(struct hci
 
 	if (sk)
 		sock_put(sk);
-
-	mgmt_pending_foreach(MGMT_OP_UNPAIR_DEVICE, hdev, unpair_device_rsp,
-			     hdev);
 }
 
 void mgmt_disconnect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr,