ASoC: Fix null pointer dereference for prtd pointer

Private data pointer may not be initialized before
access it in adsp_stream_cmd_put. NULL check for prtd
avoids the issue.

CRs-Fixed: 2250112
Change-Id: I0a033d7e867b183c329941b57b49232729191f1b
Signed-off-by: Vatsal Bucha <[email protected]>

asoc/msm-pcm-q6-v2.c

@@ -686,6 +686,7 @@ static int msm_pcm_open(struct snd_pcm_substream *substream)
 	if (!prtd->audio_client) {
 		pr_info("%s: Could not allocate memory\n", __func__);
 		kfree(prtd);
+		prtd = NULL;
 		return -ENOMEM;
 	}
 
@@ -1174,6 +1175,12 @@ static int msm_pcm_adsp_stream_cmd_put(struct snd_kcontrol *kcontrol,
 	}
 
 	prtd = substream->runtime->private_data;
+	if (prtd == NULL) {
+		pr_err("%s prtd is null.\n", __func__);
+		ret = -EINVAL;
+		goto done;
+	}
+
 	if (prtd->audio_client == NULL) {
 		pr_err("%s prtd is null.\n", __func__);
 		ret = -EINVAL;