linux-kernel - Re: KASAN: use-after-free Write in tcindex

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Date:   Tue, 17 Mar 2020 18:59:03 -0700
From:   syzbot <syzbot+ba4bcf1563f90386910f@...kaller.appspotmail.com>
To:     davem@...emloft.net, jhs@...atatu.com, jiri@...nulli.us,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        xiyou.wangcong@...il.com
Subject: Re: KASAN: use-after-free Write in tcindex_change

syzbot has bisected this bug to:

commit 599be01ee567b61f4471ee8078870847d0a11e8e
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Mon Feb 3 05:14:35 2020 +0000

    net_sched: fix an OOB access in cls_tcindex

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14dbc973e00000
start commit:   fb33c651 Linux 5.6-rc6
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16dbc973e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12dbc973e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6dfa02302d6db985
dashboard link: https://syzkaller.appspot.com/bug?extid=ba4bcf1563f90386910f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1748dfdde00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16afffdde00000

Reported-by: syzbot+ba4bcf1563f90386910f@...kaller.appspotmail.com
Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")

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