Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Rui Miguel Silva <rmfrfs@gmail.com>]

Hi,
On Thu, Aug 10, 2017 at 04:56:50PM +0300, Sakari Ailus wrote:
> Hi Hans,
> 
> On Thu, Aug 10, 2017 at 03:02:46PM +0200, Hans Verkuil wrote:
> > > @@ -534,25 +534,20 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
> > >  {
> > >  	struct gb_connection *connection = get_conn_from_light(light);
> > >  	struct device *dev = &connection->bundle->dev;
> > > -	struct v4l2_flash_config *sd_cfg;
> > > +	struct v4l2_flash_config sd_cfg = { {0} };
> > 
> > Just use '= {};'
> 
> This is GCC specific whereas { {0} } is standard C. The latter is thus
> obviously better IMO.

My thought exactly. Let keep it this way, please.

> 
> > 
> > >  	struct led_classdev_flash *fled;
> > >  	struct led_classdev *iled = NULL;
> > >  	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
> > > -	int ret = 0;
> > > -
> > > -	sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
> > > -	if (!sd_cfg)
> > > -		return -ENOMEM;
> > >  
> > >  	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
> > >  	if (channel_torch)
> > >  		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
> > > -						&sd_cfg->torch_intensity);
> > > +						&sd_cfg.torch_intensity);
> > >  
> > >  	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
> > >  	if (channel_ind) {
> > >  		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
> > > -						&sd_cfg->indicator_intensity);
> > > +						&sd_cfg.indicator_intensity);
> > >  		iled = &channel_ind->fled.led_cdev;
> > >  	}
> > >  
> > > @@ -561,27 +556,21 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
> > >  
> > >  	fled = &channel_flash->fled;
> > >  
> > > -	snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
> > > +	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
> > >  
> > >  	/* Set the possible values to faults, in our case all faults */
> > > -	sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> > > +	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> > >  		LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
> > >  		LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
> > >  		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
> > >  		LED_FAULT_LED_OVER_TEMPERATURE;
> > >  
> > >  	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
> > > -					    &v4l2_flash_ops, sd_cfg);
> > > -	if (IS_ERR_OR_NULL(light->v4l2_flash)) {
> > > -		ret = PTR_ERR(light->v4l2_flash);
> > > -		goto out_free;
> > > -	}
> > > +					    &v4l2_flash_ops, &sd_cfg);
> > > +	if (IS_ERR_OR_NULL(light->v4l2_flash))
> > 
> > Just IS_ERR since v4l2_flash_init() never returns NULL.
> 
> Will fix.

Thanks for that Sakari.

---
Cheers,
	Rui

> 
> > 
> > > +		return PTR_ERR(light->v4l2_flash);
> > >  
> > > -	return ret;
> > > -
> > > -out_free:
> > > -	kfree(sd_cfg);
> > > -	return ret;
> > > +	return 0;
> > >  }
> > >  
> > >  static void gb_lights_light_v4l2_unregister(struct gb_light *light)
> > > 
> > 
> > After those two changes:
> > 
> > Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
> 
> -- 
> Regards,
> 
> Sakari Ailus
> e-mail: sakari.ailus@iki.fi	XMPP: sailus@retiisi.org.uk