netdev - Re: [ovs-dev] [PATCH net-next v9] openvswitch: enable NSH support

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Message-ID: <20170926050215.GB5896@localhost.localdomain>
Date:   Tue, 26 Sep 2017 13:02:15 +0800
From:   "Yang, Yi" <yi.y.yang@...el.com>
To:     Eric Garver <e@...g.me>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "dev@...nvswitch.org" <dev@...nvswitch.org>,
        "jbenc@...hat.com" <jbenc@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [ovs-dev] [PATCH net-next v9] openvswitch: enable NSH support

On Tue, Sep 26, 2017 at 03:28:42AM +0800, Eric Garver wrote:
> On Mon, Sep 25, 2017 at 10:16:09PM +0800, Yi Yang wrote:
> > +
> > +	length = nsh_hdr_len(nsh_hdr);
> > +	skb_pull(skb, length);
> 
> Do you need to verify you can actually pull length bytes? I don't see
> any guarantee.

I have added skb length check in pop_nsh, so that can verify this.

> > +	err = skb_ensure_writable(skb, skb_network_offset(skb) +
> > +				  sizeof(struct nshhdr));
> 
> This calls pskb_may_pull(), but you're not pulling any data here.

set_ipv4 and set_ipv6 also used skb_ensure_writable to check if skb
has enough header length, they didn't call skb_pull in the following
part, so I think this is ok.

I have sent out v10 to fix all of your comments for v9, please help
review v10, thanks a lot.