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

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Message-ID: <CAPkvG_fGpjcVqeYgZnzNM6dpicB5YaJP9TA9bz2nUDJrHtJkGw@mail.gmail.com>
Date:	Fri, 4 Jan 2013 12:25:28 -0800
From:	Nitin Gupta <ngupta@...are.org>
To:	Greg KH <greg@...ah.com>
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 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.

Nitin
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