From 1549a69b89b7e5b1b830da897529344766728a4b Mon Sep 17 00:00:00 2001
From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Date: Tue, 12 Jul 2022 15:23:57 +0300
Subject: [PATCH] ASoC: SOF: Intel: mtl: Do not process IPC reply before firmware boot
Git-commit: 1549a69b89b7e5b1b830da897529344766728a4b
Patch-mainline: v6.0-rc1
References: jsc#PED-850

It is not yet clear, but it is possible to create a firmware so broken
that it will send a reply message before a FW_READY message (it is not
yet clear if FW_READY will arrive later).
Since the reply_data is allocated only after the FW_READY message, this
will lead to a NULL pointer dereference if not filtered out.

Reported-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220712122357.31282-4-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/sof/intel/mtl.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/sound/soc/sof/intel/mtl.c b/sound/soc/sof/intel/mtl.c
index 3a043589c12b..a5e244ea0688 100644
--- a/sound/soc/sof/intel/mtl.c
+++ b/sound/soc/sof/intel/mtl.c
@@ -512,17 +512,23 @@ static irqreturn_t mtl_ipc_irq_thread(int irq, void *context)
 		 */
 		if (primary & SOF_IPC4_MSG_DIR_MASK) {
 			/* Reply received */
-			struct sof_ipc4_msg *data = sdev->ipc->msg.reply_data;
+			if (likely(sdev->fw_state == SOF_FW_BOOT_COMPLETE)) {
+				struct sof_ipc4_msg *data = sdev->ipc->msg.reply_data;
 
-			data->primary = primary;
-			data->extension = extension;
+				data->primary = primary;
+				data->extension = extension;
 
-			spin_lock_irq(&sdev->ipc_lock);
+				spin_lock_irq(&sdev->ipc_lock);
 
-			snd_sof_ipc_get_reply(sdev);
-			snd_sof_ipc_reply(sdev, data->primary);
+				snd_sof_ipc_get_reply(sdev);
+				snd_sof_ipc_reply(sdev, data->primary);
 
-			spin_unlock_irq(&sdev->ipc_lock);
+				spin_unlock_irq(&sdev->ipc_lock);
+			} else {
+				dev_dbg_ratelimited(sdev->dev,
+						    "IPC reply before FW_READY: %#x|%#x\n",
+						    primary, extension);
+			}
 		} else {
 			/* Notification received */
 			notification_data.primary = primary;
-- 
2.35.3