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

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Date:   Tue, 21 Jan 2020 19:01:42 +0000
From:   Will Deacon <will@...nel.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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

Hi Laurent,

On Wed, Dec 18, 2019 at 06:51:53PM +0200, Laurent Pinchart wrote:
> On Wed, Dec 18, 2019 at 01:46:00PM +0100, Andrey Konovalov wrote:
> > On Wed, Dec 18, 2019 at 1:23 PM Greg Kroah-Hartman 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! =)
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> and merged in my tree. I'm so sorry for the way too long delay.

Please can you send this upstream and/or put it in linux-next? I can't see
it anywhere at the moment :(

Thanks,

Will