netdev - Re: [PATCH 1/3] ipv4: icmp: use icmp_sk

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Date:   Fri, 22 Feb 2019 09:11:22 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH 1/3] ipv4: icmp: use icmp_sk_exit()



On 02/21/2019 05:57 PM, Kefeng Wang wrote:
> Simply use icmp_sk_exit() when inet_ctl_sock_create() fail in icmp_sk_init().
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  net/ipv4/icmp.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
> index 065997f414e6..364cfe5e414b 100644
> --- a/net/ipv4/icmp.c
> +++ b/net/ipv4/icmp.c
> @@ -1245,9 +1245,7 @@ static int __net_init icmp_sk_init(struct net *net)
>  	return 0;
>  
>  fail:
> -	for_each_possible_cpu(i)
> -		inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.icmp_sk, i));
> -	free_percpu(net->ipv4.icmp_sk);
> +	icmp_sk_exit(net);
>  	return err;
>  }
>  
> 


I do not like this. Future changes in icmp_sk_exit() might trigger a bug in this seldom tested path.