netdev - Re: [syzbot] UBSAN: shift-out-of-bounds in tcf_pedit

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Date:   Thu, 12 May 2022 18:13:07 -0700
From:   syzbot <syzbot+8ed8fc4c57e9dcf23ca6@...kaller.appspotmail.com>
To:     davem@...emloft.net, edumazet@...gle.com, geliang.tang@...e.com,
        jhs@...atatu.com, jiri@...nulli.us, kuba@...nel.org,
        linux-kernel@...r.kernel.org, mathew.j.martineau@...ux.intel.com,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com
Subject: Re: [syzbot] UBSAN: shift-out-of-bounds in tcf_pedit_init

syzbot has bisected this issue to:

commit 8b796475fd7882663a870456466a4fb315cc1bd6
Author: Paolo Abeni <pabeni@...hat.com>
Date:   Tue May 10 14:57:34 2022 +0000

    net/sched: act_pedit: really ensure the skb is writable

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=158d3969f00000
start commit:   810c2f0a3f86 mlxsw: Avoid warning during ip6gre device rem..
git tree:       net
final oops:     https://syzkaller.appspot.com/x/report.txt?x=178d3969f00000
console output: https://syzkaller.appspot.com/x/log.txt?x=138d3969f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=331feb185f8828e0
dashboard link: https://syzkaller.appspot.com/bug?extid=8ed8fc4c57e9dcf23ca6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=104e9749f00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15f913b9f00000

Reported-by: syzbot+8ed8fc4c57e9dcf23ca6@...kaller.appspotmail.com
Fixes: 8b796475fd78 ("net/sched: act_pedit: really ensure the skb is writable")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection