[PATCH v2 1/1] drm/bridge: lt8912b: Fix issues found during static analysis

[Dan Carpenter]

On Wed, Mar 31, 2021 at 12:43:12PM +0200, Adrien Grassein wrote:
> @@ -635,13 +636,16 @@ static int lt8912_parse_dt(struct lt8912 *lt)
>  	lt->gp_reset = gp_reset;
>  
>  	endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
> -	if (IS_ERR(endpoint)) {
> -		ret = PTR_ERR(endpoint);
> -		goto end;
> -	}
> +	if (!endpoint)
> +		return -ENODEV;
>  
> -	lt->data_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
> +	data_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
>  	of_node_put(endpoint);
> +	if (data_lanes < 0) {
> +		dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__);
> +		return lt->data_lanes;

return data_lanes;

> +	}
> +	lt->data_lanes = data_lanes;
>  
>  	lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);
>  	if (!lt->host_node) {
> @@ -658,16 +662,18 @@ static int lt8912_parse_dt(struct lt8912 *lt)
>  	}
>  
>  	lt->hdmi_port = of_drm_find_bridge(port_node);
> -	if (IS_ERR(lt->hdmi_port)) {
> +	if (!lt->hdmi_port) {
>  		dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
> -		ret = PTR_ERR(lt->hdmi_port);
> -		of_node_put(lt->host_node);
> -		goto end;
> +		ret = -ENODEV;
> +		of_node_put(port_node);
> +		goto err_free_host_node;
>  	}
>  
>  	if (!of_device_is_compatible(port_node, "hdmi-connector")) {
>  		dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
> +		of_node_put(port_node);
>  		ret = -EINVAL;
> +		goto err_free_host_node;
>  	}
>  
>  	of_node_put(port_node);

Also, btw the success path does "return ret;" but it would be nicer to
"return 0;".

regards,
dan carpenter