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SubjectRe: [syzbot] UBSAN: shift-out-of-bounds in tcf_pedit_init
On Thu, May 12, 2022 at 3:51 PM Jakub Kicinski <kuba@kernel.org> wrote:
>
> On Thu, 12 May 2022 14:19:51 -0700 Eric Dumazet wrote:
> > On Thu, May 12, 2022 at 2:18 PM syzbot
> > > This report is generated by a bot. It may contain errors.
> > > See https://goo.gl/tpsmEJ for more information about syzbot.
> > > syzbot engineers can be reached at syzkaller@googlegroups.com.
> > >
> > > syzbot will keep track of this issue. See:
> > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> > > syzbot can test patches for this issue, for details see:
> > > https://goo.gl/tpsmEJ#testing-patches
> >
> > As mentioned earlier, this came with
> >
> > commit 8b796475fd7882663a870456466a4fb315cc1bd6
> > Author: Paolo Abeni <pabeni@redhat.com>
> > Date: Tue May 10 16:57:34 2022 +0200
> >
> > net/sched: act_pedit: really ensure the skb is writable
>
> Came in as in new stack trace for an old/existing bug, right?
> Nothing checks the shift so it'd have already tripped UBSAN
> later on in tcf_pedit_act(), anyway.

Maybe a prior syzbot was reported, and nobody cared.

Or maybe syzbot got its way into this path only recently.

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