linux-kernel - Re: [PATCH] drivers/bluetooth/hci_ldisc.c: fix possible NULL dereferences

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Date:	Mon, 30 Jul 2007 14:48:29 +0800
From:	Eugene Teo <eteo@...hat.com>
To:	Marcel Holtmann <marcel@...tmann.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/bluetooth/hci_ldisc.c: fix possible	NULL	dereferences

Hi Marcel,

Marcel Holtmann wrote:
>>>> Commit 22ad42033b7d2b3d7928fba9f89d1c7f8a3c9581 did not completely fix all 
>>>> the possible NULL dereferences. Besides hci_uart_close(), we also need to 
>>>> make sure that hdev is valid before calling hci_{unregister,free}_dev().
>>> I don't see any issue. Without HCI_UART_PROTO_SET, the hdev will never
>>> be registered. So no need to protect it twice.
>> Correct me if I am wrong. HCI_UART_PROTO_SET bit is only set if hci_uart_tty_ioctl()
>> is called with HCIUARTSETPROTO. Is it possible for the HCI device to be registered
>> and then unregistered without setting the HCI_UART_PROTO_SET bit in hdev->flags?
> 
> look at the code. The hci_uart_tty_ioctl() is the only function that can
> register the HCI device. So besides opening the TTY and set the line
> discipline, you also have to the set the UART protocol running on top. I
> don't see any way you can achieve to register a HCI device without
> setting the HCI_UART_PROTO_SET bit in hu->flags.

Ok. Thanks for the explanation.

Eugene
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