linux-kernel - Re: [PATCH 4.19 211/306] media: ov13858: Check for possible null pointer

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Message-ID: <20191203103123.GA32127@paasikivi.fi.intel.com>
Date:   Tue, 3 Dec 2019 12:31:23 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Pavel Machek <pavel@...x.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Chiranjeevi Rapolu <chiranjeevi.rapolu@...el.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 211/306] media: ov13858: Check for possible null
 pointer

Hi Pavel,

On Tue, Dec 03, 2019 at 11:22:50AM +0100, Pavel Machek wrote:
> Hi!
> 
> > From: Chiranjeevi Rapolu <chiranjeevi.rapolu@...el.com>
> > 
> > [ Upstream commit 35629182eb8f931b0de6ed38c0efac58e922c801 ]
> > 
> > Check for possible null pointer to avoid crash.
> 
> > diff --git a/drivers/media/i2c/ov13858.c b/drivers/media/i2c/ov13858.c
> > index 0e7a85c4996c7..afd66d243403b 100644
> > --- a/drivers/media/i2c/ov13858.c
> > +++ b/drivers/media/i2c/ov13858.c
> > @@ -1612,7 +1612,8 @@ static int ov13858_init_controls(struct ov13858 *ov13858)
> >  				OV13858_NUM_OF_LINK_FREQS - 1,
> >  				0,
> >  				link_freq_menu_items);
> > -	ov13858->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +	if (ov13858->link_freq)
> > +		ov13858->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> >  
> >  	pixel_rate_max = link_freq_to_pixel_rate(link_freq_menu_items[0]);
> >  	pixel_rate_min =
> 
> I don't think this is right fix. If ov13858->link_freq initialization
> fails, we want to fail the initialization, not present
> half-initialized device to userland, no?

The patch fixes the problem. The rest could be debated, but LMML is the
right place for that debate.

-- 
Regard,s

Sakari Ailus