linux-kernel - Re: Error returns not handled correctly by sysfs.c:subsys_attr

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Date:	Tue, 27 Nov 2007 14:38:39 +0900
From:	Tejun Heo <teheo@...e.de>
To:	Greg KH <greg@...ah.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, andrew.patterson@...com,
	linux-kernel@...r.kernel.org, linux-hotplug@...r.kernel.org
Subject: Re: Error returns not handled correctly by	sysfs.c:subsys_attr_store()

Greg KH wrote:
> On Mon, Nov 26, 2007 at 08:31:16PM -0800, Andrew Morton wrote:
>> On Wed, 21 Nov 2007 15:16:59 -0700 Andrew Patterson <andrew.patterson@...com> wrote:
>>
>>> The buf in fs/sysfs.c:subsys_attr_store() does not seem to be updated
>>> correctly when returning a negative value (indicating that an error
>>> condition has occurred) is returned.  If a negative value is returned,
>>> the next subsequent call to subsys_attr_store will have the contents of
>>> buf appended to the previous call.
>> subsys_attr_store() gets deleted by
>> http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-01-driver/kset-kill-subsys-attr.patch
>>
>> So maybe we will soon accidentally fix whatever-this-is?  Or maybe we will
>> faithfully maintain it.
> 
> Yes, subsys attributes go away, but this is showing a bug in the sysfs
> core with attributes, not in the "middle" layers of attributes.
> 
> I bounced the original bug report to Tejun, who has been changing the
> logic around this area to see if he sees anything that might be
> different now.
> 
> Tejun?

(groaning buried under ATA bugs) Will take a look soon.

Thanks.

-- 
tejun
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