linux-kernel - Re: KASAN: use-after-free Read in macvlan_dev_get

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Date:   Thu, 23 Jul 2020 10:06:04 -0700
From:   syzbot <syzbot+95eec132c4bd9b1d8430@...kaller.appspotmail.com>
To:     andriin@...com, ap420073@...il.com, ast@...nel.org,
        bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net,
        hawk@...nel.org, john.fastabend@...il.com, kafai@...com,
        kpsingh@...omium.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        xiyou.wangcong@...il.com, yhs@...com
Subject: Re: KASAN: use-after-free Read in macvlan_dev_get_iflink

syzbot has bisected this issue to:

commit 1a33e10e4a95cb109ff1145098175df3113313ef
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Sun May 3 05:22:19 2020 +0000

    net: partially revert dynamic lockdep key changes

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17663aef100000
start commit:   1590a2e1 Merge tag 'acpi-5.8-rc3' of git://git.kernel.org/..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=14e63aef100000
console output: https://syzkaller.appspot.com/x/log.txt?x=10e63aef100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=20c907630cbdbe5
dashboard link: https://syzkaller.appspot.com/bug?extid=95eec132c4bd9b1d8430
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1559e6e5100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16aadd29100000

Reported-by: syzbot+95eec132c4bd9b1d8430@...kaller.appspotmail.com
Fixes: 1a33e10e4a95 ("net: partially revert dynamic lockdep key changes")

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