linux-kernel - Re: [PATCH] kernel/taskstats.c: add nla_nest_cancel() for failure processing between nla_nest_start() and nla_nest

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Date:	Tue, 03 Sep 2013 13:07:13 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	bsingharora@...il.com
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] kernel/taskstats.c: add nla_nest_cancel() for failure
 processing between nla_nest_start() and nla_nest_end()

Hello maintainers:

Please help check this patch, when you have time.

Thanks.

On 08/20/2013 10:44 AM, Chen Gang wrote:
> When failure occurs between nla_nest_start() and nla_nest_end(), need
> call nla_nest_cancel() to clean up related things.
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/taskstats.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/taskstats.c b/kernel/taskstats.c
> index 145bb4d..1db6808 100644
> --- a/kernel/taskstats.c
> +++ b/kernel/taskstats.c
> @@ -404,11 +404,15 @@ static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid)
>  	if (!na)
>  		goto err;
>  
> -	if (nla_put(skb, type, sizeof(pid), &pid) < 0)
> +	if (nla_put(skb, type, sizeof(pid), &pid) < 0) {
> +		nla_nest_cancel(skb, na);
>  		goto err;
> +	}
>  	ret = nla_reserve(skb, TASKSTATS_TYPE_STATS, sizeof(struct taskstats));
> -	if (!ret)
> +	if (!ret) {
> +		nla_nest_cancel(skb, na);
>  		goto err;
> +	}
>  	nla_nest_end(skb, na);
>  
>  	return nla_data(ret);
> 


-- 
Chen Gang
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