CVE-2022-50374

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Bluetooth: hci_{ldisc,serdev}: check percpu_init_rwsem() failure<br /> <br /> syzbot is reporting NULL pointer dereference at hci_uart_tty_close() [1],<br /> for rcu_sync_enter() is called without rcu_sync_init() due to<br /> hci_uart_tty_open() ignoring percpu_init_rwsem() failure.<br /> <br /> While we are at it, fix that hci_uart_register_device() ignores<br /> percpu_init_rwsem() failure and hci_uart_unregister_device() does not<br /> call percpu_free_rwsem().