linux-kernel - Re: [PATCH 1/2] kernel/sysctl.c: check return value after call proc_put_char() in __do_proc_doulongvec

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Date:	Mon, 19 Aug 2013 22:09:00 -0700
From:	Joe Perches <joe@...ches.com>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	Mel Gorman <mgorman@...e.de>, riel@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] kernel/sysctl.c: check return value after call
 proc_put_char() in __do_proc_doulongvec_minmax()

On Tue, 2013-08-20 at 11:38 +0800, Chen Gang wrote:
> Need check the return value of proc_put_char(), just like another have
> done in __do_proc_doulongvec_minmax().
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/sysctl.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 7822cd8..ee00986 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -2214,8 +2214,11 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
>  			*i = val;
>  		} else {
>  			val = convdiv * (*i) / convmul;
> -			if (!first)
> +			if (!first) {
>  				err = proc_put_char(&buffer, &left, '\t');
> +				if (err)
> +					goto free;
> +			}

I think you should use break and convert it in
to goto free in patch 2/2.

Otherwise, this style looks out of place.

>  			err = proc_put_long(&buffer, &left, val, false);
>  			if (err)
>  				break;



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