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

Bluetooth: hci_uart: clear HCI_UART_SENDING when write_work is canceled

HCI_UART_SENDING bit in tx_state means write_work is pending and blocks
queueing it again.  Currently this bit is not cleared when canceling the
work in hci_uart_close(), which blocks future writes when device is
reopened later if write_work was pending.

Fix by clearing HCI_UART_SENDING when canceling the work.

Also make clearing of tx_skb safe by using disable_work_sync +
enable_work instead of just cancel_work_sync.  hci_uart_flush() purges
the proto tx queue so we can cancel the pending write_work there,
instead of doing it just in hci_uart_close().  Re-enable and possibly
requeue the work after queue flush.

https://git.kernel.org/stable/c/1b0d946d6f08bd39211385bc703a440911b41e46

https://git.kernel.org/stable/c/714d861d35d937f23375a4517569b13917bbbe51

https://git.kernel.org/stable/c/b9dd39cf1667e378b25a082ca796d495d578c5d3

https://git.kernel.org/stable/c/d52446b3e735cfdbdc2a58342163803bc2e64249

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