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

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Date:   Wed, 07 Oct 2020 20:38:09 -0700
From:   syzbot <syzbot+b8639c8dcb5ec4483d4f@...kaller.appspotmail.com>
To:     anant.thazhemadam@...il.com, axboe@...nel.dk,
        bgolaszewski@...libre.com, dan.j.williams@...el.com,
        dragonjetli@...il.com, gregkh@...uxfoundation.org, hch@....de,
        hl1998@...tonmail.com, jack@...e.cz, jean-philippe@...aro.org,
        johannes.thumshirn@....com, jroedel@...e.de,
        linux-block@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org, rafael@...nel.org,
        saravanak@...gle.com, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in delete_partition

syzbot suspects this issue was fixed by commit:

commit 08fc1ab6d748ab1a690fd483f41e2938984ce353
Author: Christoph Hellwig <hch@....de>
Date:   Tue Sep 1 09:59:41 2020 +0000

    block: fix locking in bdev_del_partition

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1259b1e7900000
start commit:   f75aef39 Linux 5.9-rc3
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=3c5f6ce8d5b68299
dashboard link: https://syzkaller.appspot.com/bug?extid=b8639c8dcb5ec4483d4f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15c43c79900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=173dfa1e900000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: block: fix locking in bdev_del_partition

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