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

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Date:   Mon, 20 Dec 2021 11:17:27 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Baokun Li <libaokun1@...wei.com>
Cc:     akpm@...ux-foundation.org, keescook@...omium.org,
        yzaikin@...gle.com, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, yukuai3@...wei.com,
        Hulk Robot <hulkci@...wei.com>
Subject: Re: [PATCH -next V2] sysctl: returns -EINVAL when a negative value
 is passed to proc_doulongvec_minmax

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@...wei.com>
> Signed-off-by: Baokun Li <libaokun1@...wei.com>

Acked-by: Luis Chamberlain <mcgrof@...nel.org>

 Luis