linux-kernel - Re: [syzbot] KASAN: use-after-free Read in disk_part_iter

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Date:   Sun, 21 Mar 2021 05:40:05 -0700
From:   syzbot <syzbot+8fede7e30c7cee0de139@...kaller.appspotmail.com>
To:     axboe@...nel.dk, hch@....de, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tj@...nel.org
Subject: Re: [syzbot] KASAN: use-after-free Read in disk_part_iter_next (2)

syzbot has bisected this issue to:

commit a33df75c6328bf40078b35f2040d8e54d574c357
Author: Christoph Hellwig <hch@....de>
Date:   Sun Jan 24 10:02:41 2021 +0000

    block: use an xarray for disk->part_tbl

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17989906d00000
start commit:   1c273e10 Merge tag 'zonefs-5.12-rc4' of git://git.kernel.o..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=14589906d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=10589906d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6abda3336c698a07
dashboard link: https://syzkaller.appspot.com/bug?extid=8fede7e30c7cee0de139
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13dfe8bed00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=155a117cd00000

Reported-by: syzbot+8fede7e30c7cee0de139@...kaller.appspotmail.com
Fixes: a33df75c6328 ("block: use an xarray for disk->part_tbl")

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