linux-kernel - Re: [v4l-dvb-maintainer] [2.6 patch] dvb_frontend

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Date:	Fri, 10 Aug 2007 19:47:52 +0200
From:	"Markus Rechberger" <mrechberger@...il.com>
To:	"Manu Abraham" <abraham.manu@...il.com>
Cc:	"Adrian Bunk" <bunk@...sta.de>, v4l-dvb-maintainer@...uxtv.org,
	linux-kernel@...r.kernel.org
Subject: Re: [v4l-dvb-maintainer] [2.6 patch] dvb_frontend_ioctl(): fix check-after-use

On 8/1/07, Manu Abraham <abraham.manu@...il.com> wrote:
> On 7/31/07, Adrian Bunk <bunk@...sta.de> wrote:
> > The Coverity checker spotted that we have already oops'ed if "fe" was
> NULL.
> >
> > Since "fe" being NULL seems impossible at this point this patch removes
> > the NULL check.
> >
> > Signed-off-by: Adrian Bunk <bunk@...sta.de>
> >
> > ---
> > --- linux-2.6.23-rc1-mm1/drivers/media/dvb/dvb-core/dvb_frontend.c.old
> 2007-07-29 21:41:56.000000000 +0200
> > +++ linux-2.6.23-rc1-mm1/drivers/media/dvb/dvb-core/dvb_frontend.c
> 2007-07-29 21:42:16.000000000 +0200
> > @@ -706,11 +706,11 @@ static int dvb_frontend_ioctl(struct ino
> >         struct dvb_frontend_private *fepriv = fe->frontend_priv;
> >         int err = -EOPNOTSUPP;
> >
> >         dprintk ("%s\n", __FUNCTION__);
> >
> > -       if (!fe || fepriv->exit)
> > +       if (fepriv->exit)
> >                 return -ENODEV;
> >
> >         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
> >             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
> >              cmd == FE_DISEQC_RECV_SLAVE_REPLY))
> >
> > -
>
> Acked-by: Manu Abraham <manu@...uxtv.org>
>

This issue has been known for a while including some other problems at
that part.

http://article.gmane.org/gmane.linux.drivers.dvb/35351/match=patch+dvb_net+hotplugging+support

this includes a link where this and more got discussed in May.

Markus
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