zram: fix invalid memory references during disk write

Nitin Gupta ngupta at vflare.org
Sat Dec 8 00:50:37 UTC 2012


On Thu, Nov 29, 2012 at 10:45 PM, Nitin Gupta <ngupta at vflare.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?

Thanks,
Nitin



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