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

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Date:   Thu, 6 Jun 2019 13:23:18 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Oliver Neukum <oneukum@...e.com>
Cc:     syzbot <syzbot+93f2f45b19519b289613@...kaller.appspotmail.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        rafael@...nel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>
Subject: Re: KASAN: use-after-free Read in device_del

On Thu, Jun 6, 2019 at 10:54 AM Oliver Neukum <oneukum@...e.com> wrote:
>
> Am Montag, den 03.06.2019, 04:41 -0700 schrieb syzbot:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver
> > git tree:       https://github.com/google/kasan.git usb-fuzzer
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1684d87ca00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=193d8457178b3229
> > dashboard link: https://syzkaller.appspot.com/bug?extid=93f2f45b19519b289613
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
>
> Will this do?

Hi Oliver,

Unfortunately there's no reproducer for this bug. I've looked at the
fix, but I'm not sure I understand what it does. Perhaps expanding the
patch description would help, as it doesn't make the patch any more
clear for me. But I'm not familiar with this code, so if you think
this change makes sense and supposedly fixes this bug, then please
post it.

Thanks!

>
>         Regards
>                 Oliver