asoc: Add null check for kctl private_data in volume controls

In platform driver volume controls, add null check
for kctl private data before access.

CRs-Fixed: 2611397
Change-Id: I49bdac2bb780a7116e54c20bf5f0d01f13a53165
Signed-off-by: Laxminath Kasam <[email protected]>

asoc/msm-pcm-loopback-v2.c

@@ -569,11 +569,15 @@ static int msm_pcm_volume_ctl_get(struct snd_kcontrol *kcontrol,
 {
 	int rc = 0;
 	struct snd_pcm_volume *vol = snd_kcontrol_chip(kcontrol);
-	struct snd_pcm_substream *substream =
-		vol->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+	struct snd_pcm_substream *substream = NULL;
 	struct msm_pcm_loopback *prtd;
 
 	pr_debug("%s\n", __func__);
+	if (!vol) {
+		pr_err("%s: vol is NULL\n", __func__);
+		return -ENODEV;
+	}
+	substream = vol->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 	if ((!substream) || (!substream->runtime)) {
 		pr_debug("%s substream or runtime not found\n", __func__);
 		rc = -ENODEV;

asoc/msm-pcm-q6-noirq.c

@@ -722,13 +722,17 @@ static int msm_pcm_volume_ctl_get(struct snd_kcontrol *kcontrol,
 {
 	struct snd_pcm_volume *vol = snd_kcontrol_chip(kcontrol);
 	struct msm_plat_data *pdata = NULL;
-	struct snd_pcm_substream *substream =
-		vol->pcm->streams[vol->stream].substream;
+	struct snd_pcm_substream *substream = NULL;
 	struct snd_soc_pcm_runtime *soc_prtd = NULL;
 	struct snd_soc_component *component = NULL;
 	struct msm_audio *prtd;
 
 	pr_debug("%s\n", __func__);
+	if (!vol) {
+		pr_err("%s: vol is NULL\n", __func__);
+		return -ENODEV;
+	}
+	substream = vol->pcm->streams[vol->stream].substream;
 	if (!substream) {
 		pr_err("%s substream not found\n", __func__);
 		return -ENODEV;

asoc/msm-pcm-q6-v2.c

@@ -1520,13 +1520,17 @@ static int msm_pcm_volume_ctl_get(struct snd_kcontrol *kcontrol,
 {
 	struct snd_pcm_volume *vol = snd_kcontrol_chip(kcontrol);
 	struct msm_plat_data *pdata = NULL;
-	struct snd_pcm_substream *substream =
-		vol->pcm->streams[vol->stream].substream;
+	struct snd_pcm_substream *substream = NULL;
 	struct snd_soc_pcm_runtime *soc_prtd = NULL;
 	struct snd_soc_component *component = NULL;
 	struct msm_audio *prtd;
 
 	pr_debug("%s\n", __func__);
+	if (!vol) {
+		pr_err("%s: vol is NULL\n", __func__);
+		return -ENODEV;
+	}
+	substream = vol->pcm->streams[vol->stream].substream;
 	if (!substream) {
 		pr_err("%s substream not found\n", __func__);
 		return -ENODEV;