linux-kernel - Re: [PATCH][RESEND] staging: zram: fix invalid memory references during disk write

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Date:	Tue, 8 Jan 2013 14:13:14 -0800
From:	Greg KH <greg@...ah.com>
To:	Nitin Gupta <ngupta@...are.org>
Cc:	Jerome Marchand <jmarchan@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Sam Hansen <solid.se7en@...il.com>,
	Linux Driver Project <devel@...uxdriverproject.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][RESEND] staging: zram: fix invalid memory references
 during disk write

On Tue, Jan 08, 2013 at 02:00:27PM -0800, Nitin Gupta wrote:
> On Fri, Jan 4, 2013 at 12:25 PM, Nitin Gupta <ngupta@...are.org> wrote:
> > On Wed, Jan 2, 2013 at 8:53 AM, Nitin Gupta <ngupta@...are.org> wrote:
> >> Fixes a bug introduced by commit c8f2f0db1 ("zram: Fix handling
> >> of incompressible pages") which caused invalid memory references
> >> during disk write. Invalid references could occur in two cases:
> >>  - Incoming data expands on compression: In this case, reference was
> >> made to kunmap()'ed bio page.
> >>  - Partial (non PAGE_SIZE) write with incompressible data: In this
> >> case, reference was made to a kfree()'ed buffer.
> >>
> >> Fixes bug 50081:
> >> https://bugzilla.kernel.org/show_bug.cgi?id=50081
> >>
> >
> > Greg: can you please add this to staging? It fixes an important issue
> > and is tested by many users.
> >
> 
> 
> It's still not in staging. Any reason why you want to accept this patch?

Because I'm still catching up after being on vacation for 3 weeks?  I
only got back yesterday and have a few thousand emails/patches to make
it through.  Patches for staging drivers are way down on the list of
priorities for me, especially the zram/zcache/zwhatever mess that we
currently have...

Don't worry, it's not lost, and will make it in soon, please give me a
chance.

greg k-h
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