linux-kernel - Re: [PATCH v2] staging: media: atomisp: Fix error path in lm3554

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Message-ID: <1109bb4e-ef17-0633-275f-2a279437fdc6@gmail.com>
Date:   Sat, 19 Sep 2020 20:50:44 +0100
From:   Alex Dewar <alex.dewar90@...il.com>
To:     dan.carpenter@...cle.com
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alan Cox <alan@...ux.intel.com>, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: media: atomisp: Fix error path in
 lm3554_probe()

On 2020-09-03 19:24, Alex Dewar wrote:
> The error path for lm3554_probe() contains a number of bugs, including:
>   * resource leaks
>   * jumping to error labels out of sequence
>   * not setting the return value appropriately
Ping?
>
> Fix it up and give the labels more memorable names.
>
> This issue has existed since the code was originally contributed in
> commit a49d25364dfb ("staging/atomisp: Add support for the Intel IPU v2"),
> although the code was subsequently removed altogether and then
> reinstated with commit ad85094b293e ("Revert "media: staging: atomisp: Remove driver"").
>
> Addresses-Coverity: 1496802 ("Resource leaks")
> Fixes: a49d25364dfb ("staging/atomisp: Add support for the Intel IPU v2")
> Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
> ---
>   .../media/atomisp/i2c/atomisp-lm3554.c        | 53 +++++++++++--------
>   1 file changed, 30 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/staging/media/atomisp/i2c/atomisp-lm3554.c b/drivers/staging/media/atomisp/i2c/atomisp-lm3554.c
> index 7ca7378b1859..cca10a4c2db0 100644
> --- a/drivers/staging/media/atomisp/i2c/atomisp-lm3554.c
> +++ b/drivers/staging/media/atomisp/i2c/atomisp-lm3554.c
> @@ -833,7 +833,6 @@ static void *lm3554_platform_data_func(struct i2c_client *client)
>   
>   static int lm3554_probe(struct i2c_client *client)
>   {
> -	int err = 0;
>   	struct lm3554 *flash;
>   	unsigned int i;
>   	int ret;
> @@ -843,36 +842,38 @@ static int lm3554_probe(struct i2c_client *client)
>   		return -ENOMEM;
>   
>   	flash->pdata = lm3554_platform_data_func(client);
> -	if (IS_ERR(flash->pdata))
> -		return PTR_ERR(flash->pdata);
> +	if (IS_ERR(flash->pdata)) {
> +		ret = PTR_ERR(flash->pdata);
> +		goto err_free_flash;
> +	}
>   
>   	v4l2_i2c_subdev_init(&flash->sd, client, &lm3554_ops);
>   	flash->sd.internal_ops = &lm3554_internal_ops;
>   	flash->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
>   	flash->mode = ATOMISP_FLASH_MODE_OFF;
>   	flash->timeout = LM3554_MAX_TIMEOUT / LM3554_TIMEOUT_STEPSIZE - 1;
> -	ret =
> -	    v4l2_ctrl_handler_init(&flash->ctrl_handler,
> -				   ARRAY_SIZE(lm3554_controls));
> +	ret = v4l2_ctrl_handler_init(&flash->ctrl_handler,
> +				     ARRAY_SIZE(lm3554_controls));
>   	if (ret) {
> -		dev_err(&client->dev, "error initialize a ctrl_handler.\n");
> -		goto fail2;
> +		dev_err(&client->dev, "error initializing ctrl_handler");
> +		goto err_unregister_sd;
>   	}
>   
>   	for (i = 0; i < ARRAY_SIZE(lm3554_controls); i++)
>   		v4l2_ctrl_new_custom(&flash->ctrl_handler, &lm3554_controls[i],
>   				     NULL);
>   
> -	if (flash->ctrl_handler.error) {
> -		dev_err(&client->dev, "ctrl_handler error.\n");
> -		goto fail2;
> +	ret = flash->ctrl_handler.error;
> +	if (ret) {
> +		dev_err(&client->dev, "ctrl_handler error");
> +		goto err_free_ctrl_handler;
>   	}
>   
>   	flash->sd.ctrl_handler = &flash->ctrl_handler;
> -	err = media_entity_pads_init(&flash->sd.entity, 0, NULL);
> -	if (err) {
> -		dev_err(&client->dev, "error initialize a media entity.\n");
> -		goto fail1;
> +	ret = media_entity_pads_init(&flash->sd.entity, 0, NULL);
> +	if (ret) {
> +		dev_err(&client->dev, "error initializing media entity");
> +		goto err_free_ctrl_handler;
>   	}
>   
>   	flash->sd.entity.function = MEDIA_ENT_F_FLASH;
> @@ -881,20 +882,26 @@ static int lm3554_probe(struct i2c_client *client)
>   
>   	timer_setup(&flash->flash_off_delay, lm3554_flash_off_delay, 0);
>   
> -	err = lm3554_gpio_init(client);
> -	if (err) {
> +	ret = lm3554_gpio_init(client);
> +	if (ret) {
>   		dev_err(&client->dev, "gpio request/direction_output fail");
> -		goto fail2;
> +		goto err_del_timer;
>   	}
> -	return atomisp_register_i2c_module(&flash->sd, NULL, LED_FLASH);
> -fail2:
> +
> +	ret = atomisp_register_i2c_module(&flash->sd, NULL, LED_FLASH);
> +	if (!ret)
> +		return 0;
> +
> +err_del_timer:
> +	del_timer_sync(&flash->flash_off_delay);
>   	media_entity_cleanup(&flash->sd.entity);
> +err_free_ctrl_handler:
>   	v4l2_ctrl_handler_free(&flash->ctrl_handler);
> -fail1:
> +err_unregister_sd:
>   	v4l2_device_unregister_subdev(&flash->sd);
> +err_free_flash:
>   	kfree(flash);
> -
> -	return err;
> +	return ret;
>   }
>   
>   static int lm3554_remove(struct i2c_client *client)