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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Miaoqian Lin <linmq006@gmail.com>,
        Codrin Ciubotariu <codrin.ciubotariu@microchip.com>,
        Mark Brown <broonie@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.16 0378/1017] ASoC: atmel: Fix error handling in snd_proto_probe
Date:   Tue,  5 Apr 2022 09:21:31 +0200
Message-Id: <20220405070405.506970709@linuxfoundation.org>
In-Reply-To: <20220405070354.155796697@linuxfoundation.org>
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From: Miaoqian Lin <linmq006@gmail.com>

[ Upstream commit b0bfaf0544d08d093d6211d7ef8816fb0b5b6c75 ]

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.

Fixes: a45f8853a5f9 ("ASoC: Add driver for PROTO Audio CODEC (with a WM8731)")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20220308013949.20323-1-linmq006@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/atmel/mikroe-proto.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/sound/soc/atmel/mikroe-proto.c b/sound/soc/atmel/mikroe-proto.c
index f9331f7e80fe..5b513ff7fe2d 100644
--- a/sound/soc/atmel/mikroe-proto.c
+++ b/sound/soc/atmel/mikroe-proto.c
@@ -115,7 +115,8 @@ static int snd_proto_probe(struct platform_device *pdev)
 	cpu_np = of_parse_phandle(np, "i2s-controller", 0);
 	if (!cpu_np) {
 		dev_err(&pdev->dev, "i2s-controller missing\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto put_codec_node;
 	}
 	dai->cpus->of_node = cpu_np;
 	dai->platforms->of_node = cpu_np;
@@ -125,7 +126,8 @@ static int snd_proto_probe(struct platform_device *pdev)
 						       &bitclkmaster, &framemaster);
 	if (bitclkmaster != framemaster) {
 		dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto put_cpu_node;
 	}
 	if (bitclkmaster) {
 		if (codec_np == bitclkmaster)
@@ -136,18 +138,20 @@ static int snd_proto_probe(struct platform_device *pdev)
 		dai_fmt |= snd_soc_daifmt_parse_clock_provider_as_flag(np, NULL);
 	}
 
-	of_node_put(bitclkmaster);
-	of_node_put(framemaster);
-	dai->dai_fmt = dai_fmt;
-
-	of_node_put(codec_np);
-	of_node_put(cpu_np);
 
+	dai->dai_fmt = dai_fmt;
 	ret = snd_soc_register_card(&snd_proto);
 	if (ret && ret != -EPROBE_DEFER)
 		dev_err(&pdev->dev,
 			"snd_soc_register_card() failed: %d\n", ret);
 
+
+put_cpu_node:
+	of_node_put(bitclkmaster);
+	of_node_put(framemaster);
+	of_node_put(cpu_np);
+put_codec_node:
+	of_node_put(codec_np);
 	return ret;
 }
 
-- 
2.34.1