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Date:   Mon, 30 May 2022 13:37:50 +0200
From:   Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
To:     Haowen Bai <baihaowen@meizu.com>
Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-media@vger.kernel.org, linux-staging@lists.linux.dev,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] media: atomisp-mt9m114: Fix pointer dereferenced before
 checking
Message-ID: <20220530113750.GD99280@tom-ThinkPad-T14s-Gen-2i>
References: <1653897481-25681-1-git-send-email-baihaowen@meizu.com>
 <20220530112232.GB99280@tom-ThinkPad-T14s-Gen-2i>
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On Mon, May 30, 2022 at 01:22:32PM +0200, Tommaso Merciai wrote:
> On Mon, May 30, 2022 at 03:58:01PM +0800, Haowen Bai wrote:
> > The info->data is dereferencing before null checking, so move
> > it after checking.
> > 
> > Signed-off-by: Haowen Bai <baihaowen@meizu.com>
> > ---
> >  drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
> > index 00d6842c07d6..3c81ab73cdae 100644
> > --- a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
> > +++ b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
> > @@ -616,13 +616,15 @@ static int mt9m114_get_intg_factor(struct i2c_client *client,
> >  				   struct camera_mipi_info *info,
> >  				   const struct mt9m114_res_struct *res)
> >  {
> > -	struct atomisp_sensor_mode_data *buf = &info->data;
> > +	struct atomisp_sensor_mode_data *buf;
> >  	u32 reg_val;
> >  	int ret;
> >  
> >  	if (!info)
> >  		return -EINVAL;
> >  
> > +	buf = &info->data;
> > +
> >  	ret =  mt9m114_read_reg(client, MISENSOR_32BIT,
> >  				REG_PIXEL_CLK, &reg_val);
> >  	if (ret)
> > -- 
> > 2.7.4
> > 
> 
> Hi Haowen,
> Looks good to me, thanks.
> 
> Reviewed-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>

Hi,
My bad, Dan is right. Nothing to fix here.
Sorry for previous review.

Regards,
Tommaso
> -- 
> Tommaso Merciai
> Embedded Linux Engineer
> tommaso.merciai@amarulasolutions.com
> __________________________________
> 
> Amarula Solutions SRL
> Via Le Canevare 30, 31100 Treviso, Veneto, IT
> T. +39 042 243 5310
> info@amarulasolutions.com
> www.amarulasolutions.com

-- 
Tommaso Merciai
Embedded Linux Engineer
tommaso.merciai@amarulasolutions.com
__________________________________

Amarula Solutions SRL
Via Le Canevare 30, 31100 Treviso, Veneto, IT
T. +39 042 243 5310
info@amarulasolutions.com
www.amarulasolutions.com