netdev - Re: [syzbot] [net?] WARNING in mpls_gso

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Date: Thu, 22 Feb 2024 14:27:18 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Florian Westphal <fw@...len.de>
Cc: syzbot <syzbot+99d15fcdb0132a1e1a82@...kaller.appspotmail.com>, 
	davem@...emloft.net, dsahern@...nel.org, horms@...nel.org, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in mpls_gso_segment

On Thu, Feb 22, 2024 at 1:57 PM Florian Westphal <fw@...len.de> wrote:
>
> Eric Dumazet <edumazet@...gle.com> wrote:
> > I was thinking about adding a debug check in skb_inner_network_header(skb)
> > if inner_network_header is zero (that would mean it is not 'set' yet),
> > but this would trigger even after your patch.
>
> What about adding:
>
> static inline bool skb_inner_network_header_was_set(const struct sk_buff *skb)
> {
>         return skb->inner_network_header > 0;
> }
>
> ... and using that instead of checking for negative header length
> post-subtraction?

SGTM