Bluetooth: ISO: Fix invalid context error

This moves the hci_le_terminate_big_sync call from rx_work
to cmd_sync_work, to avoid calling sleeping function from
an invalid context.

Reported-by: syzbot+c715e1bd8dfbcb1ab176@syzkaller.appspotmail.com
Fixes: a0bfde16 ("Bluetooth: ISO: Add support for connecting multiple BISes")
Signed-off-by: Iulia Tanasescu <iulia.tanasescu@nxp.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

net/bluetooth/hci_event.c

@@ -7021,6 +7021,14 @@ static void hci_le_cis_req_evt(struct hci_dev *hdev, void *data,
 	hci_dev_unlock(hdev);
 }
 
+static int hci_iso_term_big_sync(struct hci_dev *hdev, void *data)
+{
+	u8 handle = PTR_UINT(data);
+
+	return hci_le_terminate_big_sync(hdev, handle,
+					 HCI_ERROR_LOCAL_HOST_TERM);
+}
+
 static void hci_le_create_big_complete_evt(struct hci_dev *hdev, void *data,
 					   struct sk_buff *skb)
 {
@@ -7065,16 +7073,17 @@ static void hci_le_create_big_complete_evt(struct hci_dev *hdev, void *data,
 		rcu_read_lock();
 	}
 
+	rcu_read_unlock();
+
 	if (!ev->status && !i)
 		/* If no BISes have been connected for the BIG,
 		 * terminate. This is in case all bound connections
 		 * have been closed before the BIG creation
 		 * has completed.
 		 */
-		hci_le_terminate_big_sync(hdev, ev->handle,
-					  HCI_ERROR_LOCAL_HOST_TERM);
+		hci_cmd_sync_queue(hdev, hci_iso_term_big_sync,
+				   UINT_PTR(ev->handle), NULL);
 
-	rcu_read_unlock();
 	hci_dev_unlock(hdev);
 }