linux-kernel - [PATCH 5.4 34/44] ASoC: cpcap: Check for NULL pointer after calling of_get_child_by

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Date:   Mon,  7 Feb 2022 12:06:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.4 34/44] ASoC: cpcap: Check for NULL pointer after calling of_get_child_by_name

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

commit f7a6021aaf02088870559f82fc13c58cda7fea1a upstream.

If the device does not exist, of_get_child_by_name() will return NULL
pointer.
And devm_snd_soc_register_component() does not check it.
Also, I have noticed that cpcap_codec_driver has not been used yet.
Therefore, it should be better to check it in order to avoid the future
dereference of the NULL pointer.

Fixes: f6cdf2d3445d ("ASoC: cpcap: new codec")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Link: https://lore.kernel.org/r/20220111025048.524134-1-jiasheng@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/soc/codecs/cpcap.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/sound/soc/codecs/cpcap.c
+++ b/sound/soc/codecs/cpcap.c
@@ -1541,6 +1541,8 @@ static int cpcap_codec_probe(struct plat
 {
 	struct device_node *codec_node =
 		of_get_child_by_name(pdev->dev.parent->of_node, "audio-codec");
+	if (!codec_node)
+		return -ENODEV;
 
 	pdev->dev.of_node = codec_node;