# Re: \[PATCH -next V2\] sysctl: returns -EINVAL when a negative value is passed to proc\_doulongvec\_minmax

- From: libaokun (A) \<hidden\>
- Date: 2021-12-21 01:21:14 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/12/220231
- Thread: https://ratatoskr.run/linux-fsdevel/2021/12/220217/t.md

```text
在 2021/12/21 3:17, Luis Chamberlain 写道:
> 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 <redacted>
>> Signed-off-by: Baokun Li <redacted>
> Acked-by: Luis Chamberlain <mcgrof@kernel.org>
>
>   Luis
> .

Thank you for your Ack.

-- 
With Best Regards,
Baokun Li

```