linux-kernel - Re: [PATCH v2] media: atomisp: fix the uninitialized use and rename "retvalue"

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Date:   Thu, 24 Jun 2021 12:03:24 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Yizhuo <yzhai003@....edu>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juan Antonio Aldea-Armenteros <juant.aldea@...il.com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: atomisp: fix the uninitialized use and rename
 "retvalue"

On Thu, Jun 24, 2021 at 03:17:17AM +0000, Yizhuo wrote:
> Inside function mt9m114_detect(), variable "retvalue" could
> be uninitialized if mt9m114_read_reg() returns error, however, it
> is used in the later if statement, which is potentially unsafe.
> 
> The local variable "retvalue" is renamed to "model" to avoid
> confusion.
> 
> Signed-off-by: Yizhuo <yzhai003@....edu>
> ---
>  drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
> index f5de81132177..b02a8cd3dde7 100644
> --- a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
> +++ b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
> @@ -1533,16 +1533,20 @@ static struct v4l2_ctrl_config mt9m114_controls[] = {
>  static int mt9m114_detect(struct mt9m114_device *dev, struct i2c_client *client)
>  {
>  	struct i2c_adapter *adapter = client->adapter;
> -	u32 retvalue;
> +	u32 model;
> +	int ret;
>  
>  	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
>  		dev_err(&client->dev, "%s: i2c error", __func__);
>  		return -ENODEV;
>  	}
> -	mt9m114_read_reg(client, MISENSOR_16BIT, (u32)MT9M114_PID, &retvalue);
> -	dev->real_model_id = retvalue;
> +	ret = mt9m114_read_reg(client, MISENSOR_16BIT,
> +			       (u32)MT9M114_PID, &model);

Thanks for the update.

The cast seems to be there still.

> +	if (ret)
> +		return ret;
> +	dev->real_model_id = model;
>  
> -	if (retvalue != MT9M114_MOD_ID) {
> +	if (model != MT9M114_MOD_ID) {
>  		dev_err(&client->dev, "%s: failed: client->addr = %x\n",
>  			__func__, client->addr);
>  		return -ENODEV;

-- 
Sakari Ailus