Re: [PATCH -next V2] sysctl: returns -EINVAL when a negative value is passed to proc_doulongvec_minmax

[Luis Chamberlain]

On Mon, Dec 20, 2021 at 05:26:27PM +0800, Baokun Li wrote:
> When we pass a negative value to the proc_doulongvec_minmax() function,
> the function returns 0, but the corresponding interface value does not
> change.
> 
> we can easily reproduce this problem with the following commands:
>     `cd /proc/sys/fs/epoll`
>     `echo -1 > max_user_watches; echo $?; cat max_user_watches`
> 
> This function requires a non-negative number to be passed in, so when
> a negative number is passed in, -EINVAL is returned.
> 
> Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
> Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>

Acked-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>

 Luis