netdev - Re: r8169: Crash with TX segmentation offload on RTL8125

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Message-ID: <CANn89i+VvWJ+TGDpYWxU-LJZHtHo05bx6CHofM+8QdG4nmpqEA@mail.gmail.com>
Date: Wed, 22 May 2024 16:01:09 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Florian Fainelli <f.fainelli@...il.com>, Ken Milmore <ken.milmore@...il.com>, 
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, Heiner Kallweit <hkallweit1@...il.com>, 
	Realtek linux nic maintainers <nic_swsd@...ltek.com>
Subject: Re: r8169: Crash with TX segmentation offload on RTL8125

On Wed, May 22, 2024 at 3:55 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Fri, 17 May 2024 15:21:00 -0700 Florian Fainelli wrote:
> > > The patch below fixes the problem, by simply reading nr_frags a bit later, after the checksum stage.
> >
> > Yeah, that's an excellent catch and one that is bitten us before, too:
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=20d1f2d1b024f6be199a3bedf1578a1d21592bc5
> >
> > unclear what we would do in skb_shinfo() to help driver writers, rather
> > than rely upon code inspection to find such bugs.
>
> I wonder if we should add a "error injection" hook under DEBUG_NET
> to force re-allocation of skbs in any helper which may cause it?

Makes sense !