Prev: linux-next: Tree for May 28
Next: udevd high cpu hogging in kernel-2.6.34 git8 to git-13
From: Oliver Neukum on 28 May 2010 01:50
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.

Regards
Oliver
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
From: Axel Lin on 29 May 2010 05:20
2010/5/28 Oliver Neukum <oneukum(a)suse.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
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
From: Oliver Neukum on 31 May 2010 04:00
Am Montag, 31. Mai 2010 02:04:47 schrieb Axel Lin:
> This patch fixes resource reclaim in error path of acm_probe:
> 1. In the case of "out of memory (read urbs usb_alloc_urb)\n")",
> there is no need to call acm_read_buffers_free(acm) here.
> Fix it by goto alloc_fail6 instead of alloc_fail7.
> 2. 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.
> Fix it by goto alloc_fail8 instead of alloc_fail7.
> 3. 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.
> Fix it by calling device_remove_file for dev_attr_wCountryCodes before goto
> skip_countries.
>
> Signed-off-by: Axel Lin <axel.lin(a)gmail.com>
Acked-by: Oliver Neukum <oneukum(a)suse.de>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
 | 
Pages: 1
Prev: linux-next: Tree for May 28
Next: udevd high cpu hogging in kernel-2.6.34 git8 to git-13