In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: avoid...

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: avoid deadlocks in iso_sock_timeout

iso_sock_timeout() takes lock_sock, so sync disabling the timer while holding that lock may deadlock.

iso_sock_timeout() may also run concurrently with iso_conn_del(), which leads to UAF

    [Task 1]                      [Task hdev->workqueue]
    iso_sock_timeout              iso_conn_del
      iso_conn_hold_unless_zero     iso_chan_del
                       `------------> iso_conn_put
                                  caller frees hcon
      iso_conn_put
        iso_conn_free
          conn->hcon->iso_data = NULL; /* UAF */

Fix the deadlock by removing the disable from the lock_sock sections. Move the timer from iso_conn to iso_pinfo to decouple it from iso_conn which may need to be freed in lock_sock section. Convert some of the clear_timer to disable_timer.