linux-kernel - Re: [Stable-review] [28/55] [SCSI] fix crash in scsi_dispatch

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Date:	Sun, 07 Aug 2011 18:51:24 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	James Bottomley <JBottomley@...allels.com>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	stable-review@...nel.org, alan@...rguk.ukuu.org.uk,
	Greg KH <gregkh@...e.de>
Subject: Re: [Stable-review] [28/55] [SCSI] fix crash in scsi_dispatch_cmd()

On Sun, 2011-08-07 at 18:50 +0100, Ben Hutchings wrote:
> On Fri, 2011-08-05 at 17:01 -0700, Greg KH wrote:
> > 2.6.32-longterm review patch.  If anyone has any objections, please let us know.
> > 
> > ------------------
> > 
> > From: James Bottomley <James.Bottomley@...senPartnership.com>
> > 
> > commit bfe159a51203c15d23cb3158fffdc25ec4b4dda1 upstream.
> > 
> > USB surprise removal of sr is triggering an oops in
> > scsi_dispatch_command().  What seems to be happening is that USB is
> > hanging on to a queue reference until the last close of the upper
> > device, so the crash is caused by surprise remove of a mounted CD
> > followed by attempted unmount.
> [...]
> 
> This has been reported in 2.6.39.y and 3.0, but not in 2.6.32.y.

That is, AFAIK.

Ben.

> Is the fix really applicable or necessary in 2.6.32.y?



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