linux-kernel - Re: zram: fix invalid memory references during disk write

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Message-ID: <20121208194726.GD3897@kroah.com>
Date:	Sat, 8 Dec 2012 11:47:26 -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>,
	stable@...r.kernel.org
Subject: Re: zram: fix invalid memory references during disk write

On Fri, Dec 07, 2012 at 04:50:37PM -0800, Nitin Gupta wrote:
> On Thu, Nov 29, 2012 at 10:45 PM, 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
> >
> > Upstream commit ID: c8f2f0d: zram: Fix handling of incompressible pages
> > Apply to versions: 3.6.5, 3.6.6, 3.6.7, 3.6.8
> >
> 
> Greg: can you please apply these patches to above stable versions
> and also 3.6.9?

Hm, sorry, I thought this was for the 3.7 tree, I'll queue this up for
the next round of 3.6-stable patches.

thanks,

greg k-h
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