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From:   V sujith kumar Reddy <Vsujithkumar.Reddy@amd.com>
To:     <broonie@kernel.org>, <alsa-devel@alsa-project.org>
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        <Sunil-kumar.Dommati@amd.com>, <venkataprasad.potturu@amd.com>,
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        Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>,
        "moderated list:SOUND - SOUND OPEN FIRMWARE (SOF) DRIVERS" 
        <sound-open-firmware@alsa-project.org>,
        open list <linux-kernel@vger.kernel.org>
Subject: [PATCH] ASoC: SOF: amd: Fix NULL pointer crash in acp_sof_ipc_msg_data function
Date:   Mon, 8 May 2023 12:35:08 +0530
Message-ID: <20230508070510.6100-1-Vsujithkumar.Reddy@amd.com>
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Check substream and runtime variables before assigning.

Signed-off-by: V sujith kumar Reddy <Vsujithkumar.Reddy@amd.com>
---
 sound/soc/sof/amd/acp-ipc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/amd/acp-ipc.c b/sound/soc/sof/amd/acp-ipc.c
index 4e0c48a36159..749e856dc601 100644
--- a/sound/soc/sof/amd/acp-ipc.c
+++ b/sound/soc/sof/amd/acp-ipc.c
@@ -209,7 +209,12 @@ int acp_sof_ipc_msg_data(struct snd_sof_dev *sdev, struct snd_sof_pcm_stream *sp
 		acp_mailbox_read(sdev, offset, p, sz);
 	} else {
 		struct snd_pcm_substream *substream = sps->substream;
-		struct acp_dsp_stream *stream = substream->runtime->private_data;
+		struct acp_dsp_stream *stream;
+
+		if (!substream || !substream->runtime)
+			return -ESTRPIPE;
+
+		stream = substream->runtime->private_data;
 
 		if (!stream)
 			return -ESTRPIPE;
-- 
2.25.1