On 2025-05-14 3:34 PM, Wentao Liang wrote:

The avs_card_suspend_pre() and avs_card_resume_post() in es8336 calls the 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: 32e40c8d6ff9 ("ASoC: Intel: avs: Add es8336 machine board") Cc: stable@vger.kernel.org # v6.6 Signed-off-by: Wentao Liang vulab@iscas.ac.cn

---

sound/soc/intel/avs/boards/es8336.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/sound/soc/intel/avs/boards/es8336.c b/sound/soc/intel/avs/boards/es8336.c index 426ce37105ae..e31cc656f076 100644 --- a/sound/soc/intel/avs/boards/es8336.c +++ b/sound/soc/intel/avs/boards/es8336.c @@ -243,6 +243,9 @@ static int avs_card_suspend_pre(struct snd_soc_card *card) { struct snd_soc_dai *codec_dai = snd_soc_card_get_codec_dai(card, ES8336_CODEC_DAI);

• if (!codec_dai)

• return -EINVAL;
  

• return snd_soc_component_set_jack(codec_dai->component, NULL, NULL); }

@@ -251,6 +254,9 @@ static int avs_card_resume_post(struct snd_soc_card *card) struct snd_soc_dai *codec_dai = snd_soc_card_get_codec_dai(card, ES8336_CODEC_DAI); struct avs_card_drvdata *data = snd_soc_card_get_drvdata(card);

• if (!codec_dai)

• return -EINVAL;
  

• return snd_soc_component_set_jack(codec_dai->component, &data->jack, NULL); }

Hi Wentao,

Thank you for the contribution but we do not NULL-check the result of snd_soc_card_get_codec_dai() wrapper. The machine board driver (also called sound card driver) never reaches this area if all the CPU and CODEC DAIs haven't been previously accounted for and verified. Flooding sound/soc/ with such checks is a waste of LOCs.

NACK

Kind regards, Czarek