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

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Message-ID: <CACT4Y+b0Onk4AB0hkvhXgZPdk+rERFsYAQra681o6QLDH_Ct-g@mail.gmail.com>
Date:   Fri, 22 Mar 2019 13:16:44 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+b364ed862aa07c74bc62@...kaller.appspotmail.com>
Cc:     David Miller <davem@...emloft.net>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        "open list:KERNEL BUILD + fi..." <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Michal Marek <mmarek@...e.com>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: KASAN: use-after-free Write in hci_sock_release

On Fri, Mar 22, 2019 at 1:04 PM syzbot
<syzbot+b364ed862aa07c74bc62@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit c470abd4fde40ea6a0846a2beab642a578c0b8cd
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date:   Sun Feb 19 22:34:00 2017 +0000
>
>      Linux 4.10
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1664c6df200000
> start commit:   c470abd4 Linux 4.10
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7308e68273924137
> dashboard link: https://syzkaller.appspot.com/bug?extid=b364ed862aa07c74bc62
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152532bb400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f73320c00000
>
> Reported-by: syzbot+b364ed862aa07c74bc62@...kaller.appspotmail.com
> Fixes: c470abd4fde4 ("Linux 4.10")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

The same story of HCI being broken before v4.10, so this is bisected
to the release.