netdev - Re: [PATCH net-next RFC 1/5] net-timestamp: no-payload option

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Date:	Sun, 11 Jan 2015 21:26:50 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Willem de Bruijn <willemb@...gle.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	eric.dumazet@...il.com, luto@...capital.net
Subject: Re: [PATCH net-next RFC 1/5] net-timestamp: no-payload option

On Fri, Jan 09, 2015 at 12:31:55PM -0500, Willem de Bruijn wrote:
> diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
> index a317797..d81ef70 100644
> --- a/net/ipv4/ip_sockglue.c
> +++ b/net/ipv4/ip_sockglue.c
> @@ -440,7 +440,7 @@ static bool ipv4_pktinfo_prepare_errqueue(const struct sock *sk,
>  
>  	if ((ee_origin != SO_EE_ORIGIN_TIMESTAMPING) ||
>  	    (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
> -	    (!skb->dev))
> +	    (!skb->dev) || (!skb->len))
>  		return false;

Nit: You have already tested for the condition (!skb->len) ...

>  
>  	info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
> @@ -483,7 +483,7 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
>  
>  	serr = SKB_EXT_ERR(skb);
>  
> -	if (sin) {
> +	if (sin && skb->len) {
>  		sin->sin_family = AF_INET;
>  		sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
>  						   serr->addr_offset);
> @@ -496,8 +496,9 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
>  	sin = &errhdr.offender;
>  	sin->sin_family = AF_UNSPEC;
>  
> -	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
> -	    ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin)) {
> +	if (skb->len &&
> +	    (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
> +	     ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin))) {

... here.

>  		struct inet_sock *inet = inet_sk(sk);
>  
>  		sin->sin_family = AF_INET;

Thanks,
Richard
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