linux-kernel - Re: [syzbot] [net?] KASAN: slab-use-after-free Write in l2tp_session

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Date: Tue, 02 Jul 2024 02:52:01 -0700
From: syzbot <syzbot+c041b4ce3a6dfd1e63e2@...kaller.appspotmail.com>
To: davem@...emloft.net, eadavis@...com, edumazet@...gle.com, hdanton@...a.com, 
	jchapman@...alix.com, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, samuel.thibault@...-lyon.org, 
	syzkaller-bugs@...glegroups.com, tparkin@...alix.com
Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Write in l2tp_session_delete

syzbot has bisected this issue to:

commit d18d3f0a24fc4a3513495892ab1a3753628b341b
Author: James Chapman <jchapman@...alix.com>
Date:   Thu Jun 20 11:22:44 2024 +0000

    l2tp: replace hlist with simple list for per-tunnel session list

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15f2a512980000
start commit:   185d72112b95 net: xilinx: axienet: Enable multicast by def..
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17f2a512980000
console output: https://syzkaller.appspot.com/x/log.txt?x=13f2a512980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e78fc116033e0ab7
dashboard link: https://syzkaller.appspot.com/bug?extid=c041b4ce3a6dfd1e63e2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12521b9c980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1062bd46980000

Reported-by: syzbot+c041b4ce3a6dfd1e63e2@...kaller.appspotmail.com
Fixes: d18d3f0a24fc ("l2tp: replace hlist with simple list for per-tunnel session list")

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