ASoC: mediatek: Fix error handling in mt8183_da7219_max98357_dev_probe

The device_node pointer is returned by of_parse_phandle()  with refcount
incremented. We should use of_node_put() on it when done.

This function only calls of_node_put() in the regular path.
And it will cause refcount leak in error paths.
Fix this by calling of_node_put() in error handling too.

Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220316014059.19292-1-linmq006@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c b/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
index 718505c..f090dee 100644 (file)
--- a/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
+++ b/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
@@ -695,8 +695,11 @@ static int mt8183_da7219_max98357_dev_probe(struct platform_device *pdev)
        }
 
        card = (struct snd_soc_card *)of_device_get_match_data(&pdev->dev);
-       if (!card)
-               return -EINVAL;
+       if (!card) {
+               ret = -EINVAL;
+               goto put_platform_node;
+       }
+
        card->dev = &pdev->dev;
 
        hdmi_codec = of_parse_phandle(pdev->dev.of_node,
@@ -761,12 +764,15 @@ static int mt8183_da7219_max98357_dev_probe(struct platform_device *pdev)
        if (!mt8183_da7219_max98357_headset_dev.dlc.of_node) {
                dev_err(&pdev->dev,
                        "Property 'mediatek,headset-codec' missing/invalid\n");
-               return -EINVAL;
+               ret = -EINVAL;
+               goto put_hdmi_codec;
        }
 
        priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-       if (!priv)
-               return -ENOMEM;
+       if (!priv) {
+               ret = -ENOMEM;
+               goto put_hdmi_codec;
+       }
 
        snd_soc_card_set_drvdata(card, priv);
 
@@ -775,13 +781,16 @@ static int mt8183_da7219_max98357_dev_probe(struct platform_device *pdev)
                ret = PTR_ERR(pinctrl);
                dev_err(&pdev->dev, "%s failed to select default state %d\n",
                        __func__, ret);
-               return ret;
+               goto put_hdmi_codec;
        }
 
        ret = devm_snd_soc_register_card(&pdev->dev, card);
 
-       of_node_put(platform_node);
+
+put_hdmi_codec:
        of_node_put(hdmi_codec);
+put_platform_node:
+       of_node_put(platform_node);
        return ret;
 }