linux-kernel - Re: [PATCH] proc/sysctl: fix return error for proc_doulongvec

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Message-ID: <20181130191456.GX18410@garbanzo.do-not-panic.com>
Date:   Fri, 30 Nov 2018 11:14:56 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Cheng Lin <cheng.lin130@....com.cn>
Cc:     keescook@...omium.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, zhong.weidong@....com.cn,
        wang.yi59@....com.cn
Subject: Re: [PATCH] proc/sysctl: fix return error for proc_doulongvec_minmax

Cheng, thanks for the patch!

On Fri, Nov 30, 2018 at 02:35:17PM +0800, Cheng Lin wrote:
> If the number of input parameters is less than the total
> parameters, an INVAL error will be returned.

Do you mean EINVAL?

> This patch ensure no error returned in this condition, just
> like other interfaces do.

Have an actual example to reproduce?

  Luis

> Signed-off-by: Cheng Lin <cheng.lin130@....com.cn>
> ---
>  kernel/sysctl.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 5fc724e..9ee261f 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -2779,6 +2779,8 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
>  			bool neg;
>  
>  			left -= proc_skip_spaces(&p);
> +			if (!left)
> +				break;
>  
>  			err = proc_get_long(&p, &left, &val, &neg,
>  					     proc_wspace_sep,
> -- 
> 1.8.3.1
>