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

[Yu Kuai]

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
> Signed-off-by: Junrui Luo<moonafterrain@xxxxxxxxxxx>
> ---
>   drivers/md/raid10.c | 2 ++
>   1 file changed, 2 insertions(+)

-- 
Thansk,
Kuai