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

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Date:   Fri, 01 May 2020 07:49:03 -0700
From:   syzbot <syzbot+13bef047dbfffa5cd1af@...kaller.appspotmail.com>
To:     andriin@...com, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net,
        john.fastabend@...il.com, kafai@...com, khlebnikov@...dex-team.ru,
        kpsingh@...omium.org, kuba@...nel.org, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com,
        yoshfuji@...ux-ipv6.org, zeil@...dex-team.ru
Subject: Re: KASAN: use-after-free Read in inet_diag_bc_sk

syzbot has bisected this bug to:

commit b1f3e43dbfacfcd95296b0f80f84b186add9ef54
Author: Dmitry Yakunin <zeil@...dex-team.ru>
Date:   Thu Apr 30 15:51:15 2020 +0000

    inet_diag: add support for cgroup filter

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=106b15f8100000
start commit:   37ecb5b8 hinic: Use kmemdup instead of kzalloc and memcpy
git tree:       net-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=126b15f8100000
console output: https://syzkaller.appspot.com/x/log.txt?x=146b15f8100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b1494ce3fbc02154
dashboard link: https://syzkaller.appspot.com/bug?extid=13bef047dbfffa5cd1af
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12296e60100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=150c6f02100000

Reported-by: syzbot+13bef047dbfffa5cd1af@...kaller.appspotmail.com
Fixes: b1f3e43dbfac ("inet_diag: add support for cgroup filter")

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