netdev - Re: Use-after-free in Linux tc subsystem (v6.15)

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Message-ID: <CAM0EoM=jc7=JdHMdXM9hmcP2ZGF0BnByXWbMZUN44LvaGHe-DQ@mail.gmail.com>
Date: Mon, 30 Jun 2025 07:06:40 -0400
From: Jamal Hadi Salim <jhs@...atatu.com>
To: Cong Wang <xiyou.wangcong@...il.com>
Cc: Mingi Cho <mgcho.minic@...il.com>, security@...nel.org, 
	Jiri Pirko <jiri@...nulli.us>, Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Use-after-free in Linux tc subsystem (v6.15)

On Sun, Jun 29, 2025 at 5:08 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> On Sat, Jun 28, 2025 at 05:26:59PM -0400, Jamal Hadi Salim wrote:
> > On Thu, Jun 26, 2025 at 1:11 AM Mingi Cho <mgcho.minic@...il.com> wrote:
> > > Hello,
> > >
> > > I think the testcase I reported earlier actually contains two
> > > different bugs. The first is returning SUCCESS with an empty TBF qdisc
> > > in tbf_segment, and the second is returning SUCCESS with an empty QFQ
> > > qdisc in qfq_enqueue.
> > >
> >
> > Please join the list where a more general solution is being discussed here:
> > https://lore.kernel.org/netdev/aF847kk6H+kr5kIV@pop-os.localdomain/
>
> I think that one is different, the one here is related to GSO, the above
> linked one is not. Let me think about the GSO issue, since I already
> looked into it before.

TBH, they all look the same to me - at minimal, they should be tested
against Lion's patch first. Maybe there's a GSO corner case but wasnt
clear to me.

cheers,
jamal