linux-kernel - Re: [PATCH net-next] net: sched: cls_u32: use struct

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Message-ID: <be6196ae-01b3-e23e-f504-d3e53324da9b@embeddedor.com>
Date:   Thu, 23 May 2019 18:22:29 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: sched: cls_u32: use struct_size() helper

Hi all,

Friendly ping:

Who can take this?

Thanks
--
Gustavo

On 5/1/19 11:23 AM, Gustavo A. R. Silva wrote:
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes, in particular in the
> context in which this code is being used.
> 
> So, replace code of the following form:
> 
> sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)
> 
> with:
> 
> struct_size(s, keys, s->nkeys)
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  net/sched/cls_u32.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index 04e9ef088535..4b8710a266cc 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -847,7 +847,7 @@ static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp,
>  	/* Similarly success statistics must be moved as pointers */
>  	new->pcpu_success = n->pcpu_success;
>  #endif
> -	memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
> +	memcpy(&new->sel, s, struct_size(s, keys, s->nkeys));
>  
>  	if (tcf_exts_init(&new->exts, net, TCA_U32_ACT, TCA_U32_POLICE)) {
>  		kfree(new);
>