Re: [PATCH OLK-5.10 v3 2/4] md/raid10: fix overflow in safe_delay_store

[Song Liu]

On Mon, May 15, 2023 at 6:49 AM <linan666@xxxxxxxxxxxxxxx> wrote:
>
> From: Li Nan <linan122@xxxxxxxxxx>
>
> There is no input check when echo md/safe_mode_delay and overflow will
> occur. There is risk of overflow in strict_strtoul_scaled(), too. Fix it
> by using kstrtoul instead of parsing word one by one.
>
> Fixes: 72e02075a33f ("md: factor out parsing of fixed-point numbers")
> Signed-off-by: Li Nan <linan122@xxxxxxxxxx>
> Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>
> ---
>  drivers/md/md.c | 76 +++++++++++++++++++++++++++++++------------------
>  1 file changed, 48 insertions(+), 28 deletions(-)

This patch adds more complexity, which I don't really think is necessary.
Can we just check for overflow in safe_delay_store()?

Thanks,
Song