linux-kernel - [PATCH] ASoC: atmel: Fix error handling in sam9x5_wm8731_driver

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Date:   Wed, 16 Mar 2022 11:15:30 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Richard Genoud <richard.genoud@...il.com>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] ASoC: atmel: Fix error handling in sam9x5_wm8731_driver_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 path.

Fixes: fdbcb3cba54b ("ASoC: atmel: machine driver for at91sam9x5-wm8731 boards")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 sound/soc/atmel/sam9x5_wm8731.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/sound/soc/atmel/sam9x5_wm8731.c b/sound/soc/atmel/sam9x5_wm8731.c
index 7c45dc4f8c1b..99310e40e7a6 100644
--- a/sound/soc/atmel/sam9x5_wm8731.c
+++ b/sound/soc/atmel/sam9x5_wm8731.c
@@ -142,7 +142,7 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
 	if (!cpu_np) {
 		dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
 		ret = -EINVAL;
-		goto out;
+		goto out_put_codec_np;
 	}
 	dai->cpus->of_node = cpu_np;
 	dai->platforms->of_node = cpu_np;
@@ -153,12 +153,9 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
 	if (ret != 0) {
 		dev_err(&pdev->dev, "Failed to set SSC %d for audio: %d\n",
 			ret, priv->ssc_id);
-		goto out;
+		goto out_put_cpu_np;
 	}
 
-	of_node_put(codec_np);
-	of_node_put(cpu_np);
-
 	ret = devm_snd_soc_register_card(&pdev->dev, card);
 	if (ret) {
 		dev_err(&pdev->dev, "Platform device allocation failed\n");
@@ -167,10 +164,14 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
 
 	dev_dbg(&pdev->dev, "%s ok\n", __func__);
 
-	return ret;
+	goto out_put_cpu_np;
 
 out_put_audio:
 	atmel_ssc_put_audio(priv->ssc_id);
+out_put_cpu_np:
+	of_node_put(cpu_np);
+out_put_codec_np:
+	of_node_put(codec_np);
 out:
 	return ret;
 }
-- 
2.17.1