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

Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error

When hci_register_dev() fails in hci_uart_register_dev()
HCI_UART_PROTO_INIT is not cleared before calling hu->proto->close(hu)
and setting hu->hdev to NULL. This means incoming UART data will reach
the protocol-specific recv handler in hci_uart_tty_receive() after
resources are freed.

Clear HCI_UART_PROTO_INIT with a write lock before calling
hu->proto->close() and setting hu->hdev to NULL. The write lock ensures
all active readers have completed and no new reader can enter the
protocol recv path before resources are freed.

This allows the protocol-specific recv functions to remove the
"HCI_UART_REGISTERED" guard without risking a null pointer dereference
if hci_register_dev() fails.

https://git.kernel.org/stable/c/194f029a4d7f739e44ebc1f473120187b4de5104

https://git.kernel.org/stable/c/356dee1bcac4d0d9152390561fa63331ebff211b

https://git.kernel.org/stable/c/3daa5818e473ed60eb69d8b5c71b651909d28c5a

https://git.kernel.org/stable/c/68d39ea5e0adc9ecaea1ce8abd842ec972eb8718

https://git.kernel.org/stable/c/a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40

https://git.kernel.org/stable/c/ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07

https://git.kernel.org/stable/c/ed4033fb85ccaaf6c3983be3c7b037e48253d232

https://git.kernel.org/stable/c/f4b69c35813c432973d340d3600c01de106ed474

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