linux-kernel - Re: [PATCH RESEND RESEND] media: uvc: Avoid cyclic entity chains due to malformed USB descriptors

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Date:   Wed, 18 Dec 2019 13:46:00 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will@...nel.org>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH RESEND RESEND] media: uvc: Avoid cyclic entity chains due
 to malformed USB descriptors

On Wed, Dec 18, 2019 at 1:23 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Wed, Dec 18, 2019 at 11:41:38AM +0000, Will Deacon wrote:
> > On Mon, Dec 16, 2019 at 02:17:52PM +0100, Andrey Konovalov wrote:
> > > On Mon, Dec 16, 2019 at 1:16 PM Will Deacon <will@...nel.org> wrote:
> > > > On Fri, Nov 08, 2019 at 05:55:03PM +0200, Laurent Pinchart wrote:
> > > > > Thank you for the patch.
> > > > >
> > > > > I'm sorry for the delay, and will have to ask you to be a bit more
> > > > > patient I'm afraid. I will leave tomorrow for a week without computer
> > > > > access and will only be able to go through my backlog when I will be
> > > > > back on the 17th.
> > > >
> > > > Gentle reminder on this, now you've been back a month ;)
> > >
> > > I think we now have a reproducer for this issue that syzbot just reported:
> > >
> > > https://syzkaller.appspot.com/bug?extid=0a5c96772a9b26f2a876
> > >
> > > You can try you patch on it :)
> >
> > Oh wow, I *really* like the raw USB gadget thingy you have to reproduce
> > these! I also really like that this patch fixes the issue. Logs below.

Thanks! An easier way to test the patch would be to issue a syz test
command, but I'm glad you managed to set up raw gadget manually and it
worked for you.

>
> Ok, that's a good poke for me to go review that raw gadget code to see
> if it can be merged upstream :)

Looking forward to it! =)

>
> > Laurent -- can we please merge this now?
>
> Yes, that would be good to have, as this obviously fixes a problem, and
> I can take it off of my "patches to track" list....
>
> thanks,
>
> greg k-h