linux-kernel - Re: [PATCH] cdc-acm: fix resource reclaim in error path of acm

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Date:	Sat, 29 May 2010 17:15:37 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Oliver Neukum <oliver@...kum.name>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...ux.intel.com>,
	Francesco Lavra <francescolavra@...erfree.it>,
	Julian Calaby <julian.calaby@...il.com>,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH] cdc-acm: fix resource reclaim in error path of acm_probe

2010/5/28 Oliver Neukum <oneukum@...e.de>:
> Am Freitag, 28. Mai 2010 05:28:31 schrieb Axel Lin:
>> This patch fixes resource reclaim in error path of acm_probe:
>> 1. In the case of "out of memory (write urbs usb_alloc_urb)",
>> usb_alloc_urb may fail in any iteration of the for loop.
>> Current implementation does not properly free allocated snd->urb.
>
> Yes.
>
>> 2. In the case of device_create_file(&intf->dev,&dev_attr_iCountryCodeRelDate)
>> fail, acm->country_codes is kfreed. As a result, device_remove_file for
>> dev_attr_wCountryCodes will not be executed in acm_disconnect.
>
> Yes.
>
>> 3. This patch also improves the error handling by only reclaim successfully
>> allocated resources instead of iterate over all entries in the for loop.
>
> Please don't do that. Simplicity and correctness are the only goals designing
> error handling.

OK. I will send a revised version for bug fixes only.
Thanks for the review.

Axel

>
>        Regards
>                Oliver
>
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