[PATCH] Fix possible NULL Pointer Dereference in 'asoc_qcom_lpass_cpu_platform_probe'

[Gax-c <zichenxie0106@xxxxxxxxx>]

A 'devm_kzalloc' in 'asoc_qcom_lpass_cpu_platform_probe' could possibly return NULL pointer.
NULL Pointer Dereference may be triggerred in 'asoc_qcom_lpass_cpu_platform_probe' without addtional check.
Add a null check for the returned pointer.

Fixes: b5022a36d28f ("ASoC: qcom: lpass: Use regmap_field for i2sctl and dmactl registers")
Signed-off-by: Zichen Xie <zichenxie0106@xxxxxxxxx>
Reported-by: Zichen Xie <zichenxie0106@xxxxxxxxx>
Reported-by: Zijie Zhao <zzjas98@xxxxxxxxx>
Reported-by: Chenyuan Yang <chenyuan0y@xxxxxxxxx>
---
 sound/soc/qcom/lpass-cpu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
index 5a47f661e0c6..a8e56f47f237 100644
--- a/sound/soc/qcom/lpass-cpu.c
+++ b/sound/soc/qcom/lpass-cpu.c
@@ -1243,6 +1243,9 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
 	drvdata->i2sctl = devm_kzalloc(&pdev->dev, sizeof(struct lpaif_i2sctl),
 					GFP_KERNEL);
 
+	if (!drvdata->i2sctl)
+		return -ENOMEM;
+
 	/* Initialize bitfields for dai I2SCTL register */
 	ret = lpass_cpu_init_i2sctl_bitfields(dev, drvdata->i2sctl,
 						drvdata->lpaif_map);
-- 
2.25.1