[PATCH] ASoC: Intel: avs: nau8825: Add null pointer check for snd_soc_card_get_codec_dai()

[Wentao Liang <vulab@iscas.ac.cn>]

The function avs_card_suspend_pre() in nau8825 calls the function
snd_soc_card_get_codec_dai(), but does not check its return
value which is a null pointer if the function fails. This can result
in a null pointer dereference. A proper implementation can be found
in acp5x_nau8821_hw_params() and card_suspend_pre().

Add a null pointer check for snd_soc_card_get_codec_dai() to avoid null
pointer dereference when the function fails.

Fixes: 9febcd7a0180 ("ASoC: Intel: avs: nau8825: Refactor jack handling")
Cc: stable@vger.kernel.org # v6.2
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 sound/soc/intel/avs/boards/nau8825.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/soc/intel/avs/boards/nau8825.c b/sound/soc/intel/avs/boards/nau8825.c
index bf902540744c..5baeb95cd5a6 100644
--- a/sound/soc/intel/avs/boards/nau8825.c
+++ b/sound/soc/intel/avs/boards/nau8825.c
@@ -220,6 +220,11 @@ static int avs_card_suspend_pre(struct snd_soc_card *card)
 {
 	struct snd_soc_dai *codec_dai = snd_soc_card_get_codec_dai(card, SKL_NUVOTON_CODEC_DAI);
 
+	if (!codec_dai) {
+		dev_err(card->dev, "Codec dai not found\n");
+		return -EINVAL;
+	}
+
 	return snd_soc_component_set_jack(codec_dai->component, NULL, NULL);
 }
 
-- 
2.42.0.windows.2