linux-kernel - Re: KASAN: global-out-of-bounds Read in dvb_pll

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Message-ID: <CAAeHK+y3MHoeAgOtAW0pTaTBFeVzXmNpCnazsYT0wJMqhmzd0w@mail.gmail.com>
Date:   Wed, 14 Aug 2019 13:32:22 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Sean Young <sean@...s.org>
Cc:     syzbot <syzbot+8a8f48672560c8ca59dd@...kaller.appspotmail.com>,
        bnvandana@...il.com, allison@...utok.net, hverkuil-cisco@...all.nl,
        LKML <linux-kernel@...r.kernel.org>, linux-media@...r.kernel.org,
        USB list <linux-usb@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        rfontana@...hat.com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>, tskd08@...il.com
Subject: Re: KASAN: global-out-of-bounds Read in dvb_pll_attach

On Tue, Aug 13, 2019 at 10:51 PM Sean Young <sean@...s.org> wrote:
>
> On Tue, Aug 13, 2019 at 03:22:49PM +0200, Andrey Konovalov wrote:
> > On Wed, Jul 17, 2019 at 2:29 PM syzbot
> > <syzbot+8a8f48672560c8ca59dd@...kaller.appspotmail.com> wrote:
> > >
> > > Hello,
> > >
> > > syzbot has tested the proposed patch and the reproducer did not trigger
> > > crash:
> > >
> > > Reported-and-tested-by:
> > > syzbot+8a8f48672560c8ca59dd@...kaller.appspotmail.com
> > >
> > > Tested on:
> > >
> > > commit:         6a3599ce usb-fuzzer: main usb gadget fuzzer driver
> > > git tree:       https://github.com/google/kasan.git usb-fuzzer
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=d90745bdf884fc0a
> > > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > > patch:          https://syzkaller.appspot.com/x/patch.diff?x=1454f4d0600000
> > >
> > > Note: testing is done by a robot and is best-effort only.
> >
> > Hi bnvandana,
> >
> > Could you submit this patch? Syzbot testing shows that is fixes the issue.
>
> The patch had issues (see discussion in the thread). I created this patch
> but I see now I did not include the correct Reported-by: tag.
>
> https://www.mail-archive.com/linux-media@vger.kernel.org/msg148889.html

No problem, we can mark the fix manually:

#syz fix: media: dvb-frontends: use ida for pll number

Thanks!