linux-kernel - Re: [PATCH][next] media: staging: intel-ipu3: fix unsigned comparison with

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Date:   Mon, 4 Feb 2019 10:56:43 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] media: staging: intel-ipu3: fix unsigned
 comparison with < 0

On Sat, Feb 02, 2019 at 10:12:41PM +0000, Colin Ian King wrote:
> ping?

I seem to have applied this to a wrong branch, it'll now be part of my next
pull request to Mauro.

Thanks!

> 
> On 22/12/2018 11:49, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > The comparison css->pipes[pipe].bindex < 0 is always false because
> > bindex is an unsigned int.  Fix this by using a signed integer for
> > the comparison.
> > 
> > Detected by CoverityScan, CID#1476023 ("Unsigned compared against 0")
> > 
> > Fixes: f5f2e4273518 ("media: staging/intel-ipu3: Add css pipeline programming")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >  drivers/staging/media/ipu3/ipu3-css.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/staging/media/ipu3/ipu3-css.c b/drivers/staging/media/ipu3/ipu3-css.c
> > index 44c55639389a..b9354d2bb692 100644
> > --- a/drivers/staging/media/ipu3/ipu3-css.c
> > +++ b/drivers/staging/media/ipu3/ipu3-css.c
> > @@ -1751,7 +1751,7 @@ int ipu3_css_fmt_try(struct ipu3_css *css,
> >  					&q[IPU3_CSS_QUEUE_OUT].fmt.mpix;
> >  	struct v4l2_pix_format_mplane *const vf =
> >  					&q[IPU3_CSS_QUEUE_VF].fmt.mpix;
> > -	int i, s;
> > +	int i, s, ret;
> >  
> >  	/* Adjust all formats, get statistics buffer sizes and formats */
> >  	for (i = 0; i < IPU3_CSS_QUEUES; i++) {
> > @@ -1826,12 +1826,12 @@ int ipu3_css_fmt_try(struct ipu3_css *css,
> >  	s = (bds->height - gdc->height) / 2 - FILTER_SIZE;
> >  	env->height = s < MIN_ENVELOPE ? MIN_ENVELOPE : s;
> >  
> > -	css->pipes[pipe].bindex =
> > -		ipu3_css_find_binary(css, pipe, q, r);
> > -	if (css->pipes[pipe].bindex < 0) {
> > +	ret = ipu3_css_find_binary(css, pipe, q, r);
> > +	if (ret < 0) {
> >  		dev_err(css->dev, "failed to find suitable binary\n");
> >  		return -EINVAL;
> >  	}
> > +	css->pipes[pipe].bindex = ret;
> >  
> >  	dev_dbg(css->dev, "Binary index %d for pipe %d found.",
> >  		css->pipes[pipe].bindex, pipe);
> > 
> 

-- 
Sakari Ailus
sakari.ailus@...ux.intel.com