linux-kernel - Re: [PATCH V3] staging: dgap: implement error handling in dgap_tty

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Message-ID: <CAHb8M2CaKEJ=+KQtom9QSXGJoPEXEpJkQgByn5VWpZ9ruO9gAQ@mail.gmail.com>
Date:	Mon, 19 May 2014 18:45:13 +0900
From:	DaeSeok Youn <daeseok.youn@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Lidza Louina <lidza.louina@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Mark Hounschell <markh@...pro.net>,
	driverdev-devel@...uxdriverproject.org,
	devel <devel@...verdev.osuosl.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3] staging: dgap: implement error handling in dgap_tty_register()

2014-05-19 18:39 GMT+09:00 DaeSeok Youn <daeseok.youn@...il.com>:
> 2014-05-19 17:02 GMT+09:00 Dan Carpenter <dan.carpenter@...cle.com>:
>> Nice, but it needs a couple style improvements below.
>>
>> On Mon, May 19, 2014 at 11:10:30AM +0900, Daeseok Youn wrote:
>>> +     brd->dgap_major_serial_registered = TRUE;
>>> +     dgap_boards_by_major[brd->serial_driver->major] = brd;
>>> +     brd->dgap_serial_major = brd->serial_driver->major;
>>> +
>>>       brd->dgap_major_transparent_print_registered = TRUE;
>>>       dgap_boards_by_major[brd->print_driver->major] = brd;
>>>       brd->dgap_transparent_print_major = brd->print_driver->major;
>>>
>>>       return rc;
>>
>>         return 0;
> OK. I will remove "int rc = 0" line and change "return rc" to "return 0"
Oh.. just remove the initialization to zero.
>
>>
>>> +
>>> +unregister_serial_drv:
>>> +     tty_unregister_driver(brd->serial_driver);
>>> +free_print_ttys:
>>> +     kfree(brd->print_driver->ttys);
>>> +     brd->print_driver->ttys = NULL;
>>
>> This label isn't needed.  Just goto free_print_drv, because that will
>> free the brd->print_driver->ttys in destruct_tty_driver().
>> I do like how you noticed the double free and avoided it by setting
>> brd->serial_driver->ttys to NULL, so your patch doesn't introduce a
>> double free bug.
> Yes, just goto free_print_drv.
>
> Thanks for review.
>
> Regards,
> Daeseok Youn
>>
>>> +free_print_drv:
>>> +     put_tty_driver(brd->print_driver);
>>> +free_serial_ttys:
>>> +     kfree(brd->serial_driver->ttys);
>>> +     brd->serial_driver->ttys = NULL;
>>
>> Same for this.
>>
>>> +free_serial_drv:
>>> +     put_tty_driver(brd->serial_driver);
>>> +
>>> +     return rc;
>>
>> regards,
>> dan carpenter
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