netdev - Re: [PATCH net] ping: fix the dif and sdif check in ping

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Date:   Thu, 17 Feb 2022 07:57:12 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, davem@...emloft.net,
        Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: [PATCH net] ping: fix the dif and sdif check in ping_lookup

On Wed, 16 Feb 2022 00:20:52 -0500 Xin Long wrote:
>  	if (skb->protocol == htons(ETH_P_IP)) {
> +		dif = inet_iif(skb);
> +		sdif = inet_sdif(skb);
>  		pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
>  			 (int)ident, &ip_hdr(skb)->daddr, dif);
>  #if IS_ENABLED(CONFIG_IPV6)
>  	} else if (skb->protocol == htons(ETH_P_IPV6)) {
> +		dif = inet6_iif(skb);
> +		sdif = inet6_sdif(skb);
>  		pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
>  			 (int)ident, &ipv6_hdr(skb)->daddr, dif);
>  #endif
> +	} else {
> +		pr_err("ping: protocol(%x) is not supported\n", ntohs(skb->protocol));
> +		return NULL;
>  	}

Are you sure this is not reachable from some networking path allowing
attacker (or local user) to DoS the kernel logs?