linux-kernel - Re: [PATCH v2 media-next] media: rkisp1: Fix unused value issue

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Message-ID: <ZzwoB4jt9LyTm0x7@HOME-PC>
Date: Tue, 19 Nov 2024 11:24:15 +0530
From: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
To: Jacopo Mondi <jacopo.mondi@...asonboard.com>
Cc: dafna@...tmail.com, laurent.pinchart@...asonboard.com,
	linux-media@...r.kernel.org, mchehab@...nel.org, heiko@...ech.de,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 media-next] media: rkisp1: Fix unused value issue

On Mon, Nov 18, 2024 at 11:18:34AM +0100, Jacopo Mondi wrote:
> Hi Dheeraj
> 
> On Mon, Nov 18, 2024 at 03:07:21PM +0530, Dheeraj Reddy Jonnalagadda wrote:
> > This commit fixes an unused value issue detected by Coverity (CID
> > 1519008). If ret is set to an error value in the switch statement, it is
> > not handled before being overwritten later.
> >
> > Signed-off-by: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
> 
> Indeed there's something fishy here, however the issue is not very
> much about ret being overritten but rather the error condition
> 
> 	fwnode_graph_for_each_endpoint(fwnode, ep) {
> 		switch (reg) {
> 		case 0:
>         HERE   ---->   (!rkisp1_has_feature(rkisp1, MIPI_CSI2)) {
> 				ret = -EINVAL;
> 				break;
> 			}
> 
> 			break;
> 
> 		case 1:
> 			vep.bus_type = V4L2_MBUS_UNKNOWN;
> 			break;
> 		}
>         }
> 
> breaks the inner switch and not the for loop.
> 
> I would
> 1) Slight reword the commit message to make it about missing an error
> condition
> 2) Add a Fixes tag
>    Fixes: 7d4f126fde89 ("media: rkisp1: Make the internal CSI-2 receiver optional")
>    so that this is collected in the stable trees
> 
> > ---
> >  drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> > index dd114ab77800..9ad5026ab10a 100644
> > --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> > +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> > @@ -228,6 +228,9 @@ static int rkisp1_subdev_notifier_register(struct rkisp1_device *rkisp1)
> >  			break;
> >  		}
> >
> > +		if (ret)
> > +			break;
> > +
> 
> The change is correct
> Reviewed-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>
> 
> Thanks
>   j
> 
> >  		/* Parse the endpoint and validate the bus type. */
> >  		ret = v4l2_fwnode_endpoint_parse(ep, &vep);
> >  		if (ret) {
> > --
> > 2.34.1
> >
> >
Hi Jacopo,

Thank you for your feedback. I agree with your suggestion and will update 
the commit message to describe the missing error condition.

-Dheeraj