linux-kernel - Re: [PATCH v2] iio: temperature: mlx90635: Fix ERR_PTR dereference in mlx90635

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Date: Sun, 19 May 2024 20:00:53 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Cc: Crt Mori <cmo@...exis.com>, Lars-Peter Clausen <lars@...afoo.de>,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
 error27@...il.com
Subject: Re: [PATCH v2] iio: temperature: mlx90635: Fix ERR_PTR dereference
 in mlx90635_probe()

On Sun, 19 May 2024 19:06:55 +0530
Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com> wrote:

> Hi Jonathan,
> 
> On 19/05/24 17:59, Jonathan Cameron wrote:
> > On Mon, 13 May 2024 13:34:27 -0700
> > Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com> wrote:
> >   
> >> When devm_regmap_init_i2c() fails, regmap_ee could be error pointer,
> >> instead of checking for IS_ERR(regmap_ee), regmap is checked which looks
> >> like a copy paste error.
> >>
> >> Fixes: a1d1ba5e1c28 ("iio: temperature: mlx90635 MLX90635 IR Temperature sensor")
> >> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>  
> > Please make sure to pick up tags given on earlier versions.  You dropped
> > Crt's Reviewed-by without giving a reasons. I've put it back.
> >   
> 
> Sorry, I thought we should not add tags as v1-->v2: is for addressing 
> the reviewers(Crt's) comments.
> 
> I will keep this in mind.
It's a case of judging if they are likely to mind the changes.
Here Crt had confirmed he was, so easy decision!

If you drop a tag, just say why below the --- in the patch.



> 
> Thanks,
> Harshit
> 
> > Applied to the fixes-togreg branch of iio.git and marked for stable.
> > I'll be rebasing that on rc1 once available. Until then it won't be visible.
> > 
> > Thanks,
> > 
> > Jonathan
> >   
> >> ---
> >> This is found using smatch, only compile tested.
> >> v1->v2: Address Crt's comments.
> >> ---
> >>   drivers/iio/temperature/mlx90635.c | 6 +++---
> >>   1 file changed, 3 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/iio/temperature/mlx90635.c b/drivers/iio/temperature/mlx90635.c
> >> index 1f5c962c1818..f7f88498ba0e 100644
> >> --- a/drivers/iio/temperature/mlx90635.c
> >> +++ b/drivers/iio/temperature/mlx90635.c
> >> @@ -947,9 +947,9 @@ static int mlx90635_probe(struct i2c_client *client)
> >>   				     "failed to allocate regmap\n");
> >>   
> >>   	regmap_ee = devm_regmap_init_i2c(client, &mlx90635_regmap_ee);
> >> -	if (IS_ERR(regmap))
> >> -		return dev_err_probe(&client->dev, PTR_ERR(regmap),
> >> -				     "failed to allocate regmap\n");
> >> +	if (IS_ERR(regmap_ee))
> >> +		return dev_err_probe(&client->dev, PTR_ERR(regmap_ee),
> >> +				     "failed to allocate EEPROM regmap\n");
> >>   
> >>   	mlx90635 = iio_priv(indio_dev);
> >>   	i2c_set_clientdata(client, indio_dev);  
> >   
>