Re: [PATCH] md/raid10: fix divide-by-zero in setup_geo() with zero far_copies

[Yuhao Jiang]

Hi Kuai,

Looks like different maintainers have different rules. :(
Can you send me the patchwork resource?

Thanks.

On Tue, Apr 28, 2026 at 4:32 PM Yu Kuai <yukuai@xxxxxxxxx> wrote:
>
> Hi,
>
> 在 2026/4/19 13:59, Yuhao Jiang 写道:
> > Hi Kuai,
> >
> > This report was reported by me, so Junrui added me as Reported-by.
>
> This is fine, however, please do not add downstream reported-by tag.
> If you want to add the reported-by tag, please report the problem to
> patchwork first. :)
>
> >
> > Thanks,
> >
> > On Sun, Apr 19, 2026 at 12:43 AM Yu Kuai <yukuai@xxxxxxxxx> wrote:
> >
> >     Hi,
> >
> >     在 2026/4/16 11:39, Junrui Luo 写道:
> >     > setup_geo() extracts near_copies (nc) and far_copies (fc) from the
> >     > user-provided layout parameter without checking for zero. When fc=0
> >     > with the "improved" far set layout selected, 'geo->far_set_size =
> >     > disks / fc' triggers a divide-by-zero.
> >     >
> >     > Validate nc and fc immediately after extraction, returning -1 if
> >     > either is zero.
> >     >
> >     > Fixes: 475901aff158 ("MD RAID10: Improve redundancy for 'far'
> >     and 'offset' algorithms (part 1)")
> >     > Reported-by: Yuhao Jiang<danisjiang@xxxxxxxxx>
> >
> >     So again I can't find a report, and Reported-by usually should be
> >     followed
> >     by a Closes link to the original report.
> >
> >     Applied with Reported-by tag removed.
> >
> >     > Cc:stable@xxxxxxxxxxxxxxx <mailto:Cc%3Astable@xxxxxxxxxxxxxxx>
> >     > Signed-off-by: Junrui Luo<moonafterrain@xxxxxxxxxxx>
> >     > ---
> >     >   drivers/md/raid10.c | 2 ++
> >     >   1 file changed, 2 insertions(+)
> >
> >     --
> >     Thansk,
> >     Kuai
> >
> >
> >
> > --
> > Yuhao Jiang
>
> --
> Thansk,
> Kuai



-- 
Yuhao Jiang