linux-kernel - Re: [PATCH] driver-core: don't free devt

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Message-ID: <Pine.LNX.4.44L0.0705101150100.3498-100000@iolanthe.rowland.org>
Date:	Thu, 10 May 2007 11:52:32 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tejun Heo <htejun@...il.com>
cc:	Greg KH <greg@...ah.com>, Chris Rankin <rankincj@...oo.com>,
	<linux-usb-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>, <stable@...nel.org>
Subject: Re: [PATCH] driver-core: don't free devt_attr till the device is
 released

On Thu, 10 May 2007, Tejun Heo wrote:

> Currently, devt_attr for the "dev" file is freed immediately on device
> removal, but if the "dev" sysfs file is open when a device is removed,
> sysfs will access its attribute structure for further access including
> close resulting in jumping to garbled address.  Fix it by postponing
> freeing devt_attr to device release time.
> 
> Note that devt_attr for class_device is already freed on release.
> 
> This bug is reported by Chris Rankin as bugzilla bug#8198.
> 
> Signed-off-by: Tejun Heo <htejun@...il.com>
> Cc: Chris Rankin <rankincj@...oo.com>
> ---
> Applies well to 2.6.20 and 21.  As sysfs-immediate-disconnect doesn't
> seem to be included in 2.6.22, this should be included in linus#master
> too (applies well there as well).

Although sysfs-immediate-disconnect may not be included in 2.6.22, the old 
attribute-orphan code by Oliver Neukum is present there and also in 
2.6.21.  Shouldn't that suffice?

Alan Stern

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