netdev - Re: [PATCH net] net: gso: Fix skb_segment splat when splitting gso_size mangled skb having linear-headed frag

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Message-ID: <20190906183707.3eaacd79@pixies>
Date:   Fri, 6 Sep 2019 18:37:07 +0300
From:   Shmulik Ladkani <shmulik@...anetworks.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Alexander Duyck <alexander.duyck@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>, eyal@...anetworks.com,
        netdev <netdev@...r.kernel.org>,
        Shmulik Ladkani <shmulik.ladkani@...il.com>
Subject: Re: [PATCH net] net: gso: Fix skb_segment splat when splitting
 gso_size mangled skb having linear-headed frag_list

On Fri, 6 Sep 2019 10:49:55 -0400
Willem de Bruijn <willemdebruijn.kernel@...il.com> wrote:

> But I wonder whether it is a given that head_skb has headlen.

This is what I observed for GRO packets that do have headlen frag_list
members: the 'head_skb' itself had a headlen too, and its head was
built using the original gso_size (similar to the frag_list members).

Maybe Eric can comment better.

> Btw, it seems slightly odd to me tot test head_frag before testing
> headlen in the v2 patch.

Requested by Alexander. I'm fine either way.

Thanks
Shmulik