linux-kernel - Re: Re: general protection fault in usb_set

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Message-ID: <Pine.LNX.4.44L0.1912161002080.1406-100000@iolanthe.rowland.org>
Date:   Mon, 16 Dec 2019 10:05:11 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Andrey Konovalov <andreyknvl@...gle.com>
cc:     syzbot <syzbot+7fa38a608b1075dfd634@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>, <mans@...sr.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: Re: general protection fault in usb_set_interface

On Mon, 16 Dec 2019, Andrey Konovalov wrote:

> On Fri, Dec 13, 2019 at 8:51 PM Alan Stern <stern@...land.harvard.edu> wrote:
> >
> > On Fri, 13 Dec 2019, Andrey Konovalov wrote:
> >
> > > > > Let's retry here:
> > > >
> > > > > #syz test: https://github.com/google/kasan.git f0df5c1b
> > > >
> > > > This bug is already marked as fixed. No point in testing.
> > > >
> > >
> > > Hm, that explains some of the weirdness. It doesn't explain though
> > > neither why the patch was actually tested when Alan requested it nor
> > > why syzbot sent no reply.
> >
> > In the meantime, is there any way to get syzbot to test the new patch
> > with the old reproducer?  Perhaps tell it to re-open this bug?
> 
> No, we can only test this manually now. I can run the reproducer for
> you. Should I revert the fix for this bug and then apply your patch?
> What's the expected result?

Please simply run the patch as it is, with no other changes.  The 
expected result is a use-after-free Read in usbvision_v4l2_open, just 
as with c7b0ec009a216143df30.

Alan Stern