linux-kernel - Re: [PATCH][next] media: i2c: imx334: Fix a read of the uninitialized variable ret

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Date:   Thu, 11 Feb 2021 13:41:48 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Colin King <colin.king@...onical.com>,
        "Paul J . Murphy" <paul.j.murphy@...el.com>,
        Daniele Alessandrelli <daniele.alessandrelli@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Martina Krasteva <martinax.krasteva@...el.com>,
        Gjorgji Rosikopulos <gjorgjix.rosikopulos@...el.com>,
        linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] media: i2c: imx334: Fix a read of the
 uninitialized variable ret

On Wed, Feb 10, 2021 at 11:03:03PM +0200, Sakari Ailus wrote:
> Hi Colin,
> 
> On Wed, Feb 10, 2021 at 07:07:52PM +0000, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > Currently there is a dev_err error message that is printing the
> > error status in variable ret (that has not been set) instead of
> > the correct error status from imx334->reset_gpio.  Fix this.
> > 
> > Addresses-Coverity: ("Uninitialized scalar variable")
> > Fixes: 9746b11715c3 ("media: i2c: Add imx334 camera sensor driver")
> > 
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >  drivers/media/i2c/imx334.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c
> > index 07e31bc2ef18..f8b1caf26c9b 100644
> > --- a/drivers/media/i2c/imx334.c
> > +++ b/drivers/media/i2c/imx334.c
> > @@ -790,7 +790,8 @@ static int imx334_parse_hw_config(struct imx334 *imx334)
> >  	imx334->reset_gpio = devm_gpiod_get_optional(imx334->dev, "reset",
> >  						     GPIOD_OUT_LOW);
> >  	if (IS_ERR(imx334->reset_gpio)) {
> > -		dev_err(imx334->dev, "failed to get reset gpio %d", ret);
> > +		dev_err(imx334->dev, "failed to get reset gpio %ld",
> > +			IS_ERR_VALUE(imx334->reset_gpio));

IS_ERR_VALUE() isn't right.  It would always print 1 here.  It should
just be PTR_ERR().

IS_ERR_VALUE() is like IS_ERR() but for when you're storing memory
addresses in an unsigned long variable.  get_unmapped_area(), for
example, returns unsigned longs.

regards,
dan carpenter