zram: fix invalid memory references during disk write

Nitin Gupta ngupta at vflare.org
Wed Dec 19 07:21:28 UTC 2012


On 12/18/2012 07:49 PM, Greg KH wrote:
> On Tue, Dec 18, 2012 at 01:12:05PM -0800, Nitin Gupta wrote:
>> On Tue, Dec 11, 2012 at 10:27 AM, Greg KH <gregkh at linuxfoundation.org> wrote:
>>> On Thu, Nov 29, 2012 at 10:45:09PM -0800, Nitin Gupta 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
>>>>
>>>> Cc: <stable at vger.kernel.org> # staging-next: 37b51fd: zram: factor-out
>>>>                               # zram_decompress_page() function
>>>> Signed-off-by: Nitin Gupta <ngupta at vflare.org>
>>>> Reported-by: Mihail Kasadjikov <hamer.mk at gmail.com>
>>>> Reported-by: Tomas M <tomas at slax.org>
>>>> Reviewed-by: Minchan Kim <minchan at kernel.org>
>>>> ---
>>>>  drivers/staging/zram/zram_drv.c |   39 ++++++++++++++++++++++++---------------
>>>>  1 file changed, 24 insertions(+), 15 deletions(-)
>>>
>>> This patch fails to apply to 3.6.10:
>>>
>>> patching file drivers/staging/zram/zram_drv.c
>>> Hunk #1 succeeded at 282 (offset 17 lines).
>>> Hunk #2 FAILED at 286.
>>> Hunk #3 succeeded at 319 (offset 17 lines).
>>> Hunk #4 succeeded at 340 (offset 17 lines).
>>> Hunk #5 succeeded at 353 (offset 17 lines).
>>> Hunk #6 succeeded at 368 (offset 17 lines).
>>> Hunk #7 succeeded at 385 (offset 17 lines).
>>> 1 out of 7 hunks FAILED -- saving rejects to file drivers/staging/zram/zram_drv.c.rej
>>>
>>> Please redo this patch and resend it if you wish for it to be applied to
>>> the 3.6-stable tree.
>>>
>>>
>>
>> Please apply this patch to stable tree asap.
> 
> 3.6 is now end-of-life, there will not be any more releases for that
> kernel series anymore, sorry.
> 

Then please apply to 3.7.

Nitin





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