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Date:   Tue, 24 Sep 2019 16:38:04 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Alan Stern <stern@rowland.harvard.edu>
Cc:     Andrey Konovalov <andreyknvl@google.com>,
        syzbot <syzbot+dbd38fbb686a9681143a@syzkaller.appspotmail.com>,
        LKML <linux-kernel@vger.kernel.org>,
        USB list <linux-usb@vger.kernel.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: general protection fault in open_rio
Message-ID: <20190924143804.GA623902@kroah.com>
References: <CAAeHK+wE8ngx2Pa9=vD6Fw6MCbHpxfX6ss97deQUsmGD_Bw_Bw@mail.gmail.com>
 <Pine.LNX.4.44L0.1909241031550.6144-100000@netrider.rowland.org>
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On Tue, Sep 24, 2019 at 10:33:12AM -0400, Alan Stern wrote:
> On Tue, 24 Sep 2019, Andrey Konovalov wrote:
> 
> > On Tue, Sep 24, 2019 at 4:19 PM syzbot
> > <syzbot+dbd38fbb686a9681143a@syzkaller.appspotmail.com> wrote:
> > >
> > > Hello,
> > >
> > > syzbot found the following crash on:
> > >
> > > HEAD commit:    d9e63adc 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=1602b303600000
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=f4fa60e981ee8e6a
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=dbd38fbb686a9681143a
> > > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > >
> > > Unfortunately, I don't have any reproducer for this crash yet.
> > >
> > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > Reported-by: syzbot+dbd38fbb686a9681143a@syzkaller.appspotmail.com
> 
> > Most probably the same bug:
> > 
> > https://syzkaller.appspot.com/bug?extid=745b0dff8028f9488eba
> > 
> > #syz dup: KASAN: invalid-free in disconnect_rio (2)
> 
> Even more to the point, a patch was recently posted to the mailing list 
> to remove the rio500 driver entirely:
> 
> 	https://marc.info/?l=linux-usb&m=156925553004947&w=2

I'll be queueing this up and just marking the driver BROKEN on older
kernels to solve all of these issues :)

thanks,

greg k-h