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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Wed, 11 Nov 2020 12:13:07 +0100
Message-ID: <CACT4Y+ba6jB8h1AptYx31AKsW=adXfgSyr1AdEEyqLmy=d6b9w@mail.gmail.com>
Subject: Re: KASAN: use-after-free Read in delete_partition
To:     syzbot <syzbot+b8639c8dcb5ec4483d4f@syzkaller.appspotmail.com>
Cc:     Anant Thazhemadam <anant.thazhemadam@gmail.com>,
        Jens Axboe <axboe@kernel.dk>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Dan Williams <dan.j.williams@intel.com>, dragonjetli@gmail.com,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Christoph Hellwig <hch@lst.de>, hl1998@protonmail.com,
        Jan Kara <jack@suse.cz>, jean-philippe@linaro.org,
        johannes.thumshirn@wdc.com, jroedel@suse.de,
        linux-block <linux-block@vger.kernel.org>,
        linux-kernel-mentees@lists.linuxfoundation.org,
        LKML <linux-kernel@vger.kernel.org>,
        Rafael Wysocki <rafael@kernel.org>,
        Saravana Kannan <saravanak@google.com>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>
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On Thu, Oct 8, 2020 at 5:38 AM syzbot
<syzbot+b8639c8dcb5ec4483d4f@syzkaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 08fc1ab6d748ab1a690fd483f41e2938984ce353
> Author: Christoph Hellwig <hch@lst.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

#syz fix: block: fix locking in bdev_del_partition