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

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Message-ID: <CAAeHK+xdVmEFtK78bWd2Odn0uBynqnt5UT9jZJFvqGL=_9NU2w@mail.gmail.com>
Date:   Mon, 16 Dec 2019 14:17:52 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Will Deacon <will@...nel.org>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.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 Mon, Dec 16, 2019 at 1:16 PM Will Deacon <will@...nel.org> wrote:
>
> Hi Laurent,
>
> 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 ;)

Hi Will,

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 :)

There's also another one, which looks related:

https://syzkaller.appspot.com/bug?extid=0b0095300dfeb8a83dc8

Thanks!