ASoC: cpcap: Check for NULL pointer after calling of_get_child_by_name

BugLink: https://bugs.launchpad.net/bugs/1964634
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@iscas.ac.cn>
Link: https://lore.kernel.org/r/20220111025048.524134-1-jiasheng@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/sound/soc/codecs/cpcap.c b/sound/soc/codecs/cpcap.c
index 1902689c5ea2c7f4612c186b535a782070b59ac7..acd88fe38cd4cb4cb917055ebbeec20bb1a3c349 100644 (file)
--- a/sound/soc/codecs/cpcap.c
+++ b/sound/soc/codecs/cpcap.c
@@ -1541,6 +1541,8 @@ static int cpcap_codec_probe(struct platform_device *pdev)
 {
        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;