From 81acac8c2c88764c773811d1ec858852f81eb88a Mon Sep 17 00:00:00 2001
From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Date: Wed, 9 Mar 2022 13:01:04 +0200
Subject: [PATCH] ASoC: SOF: ipc-msg-injector: Use devm_kzalloc() for the rx_buffer
Git-commit: 81acac8c2c88764c773811d1ec858852f81eb88a
Patch-mainline: v5.18-rc1
References: jsc#PED-850

The rx_buffer is cleared before sending an IPC to make sure that when the
/sys/kernel/debug/sof/ipc_msg_inject file is read we will have correct
information in the buffer (no random or stale data).

But if the user reads the file before sending any message the buffer might
contain garbage which should not be interpreted.

To prevent this, clear the rx_buffer on allocation.

Fixes: cac0b0887e53 ("ASoC: SOF: Convert the generic IPC message injector into SOF client")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@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/20220309110104.18370-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/sof/sof-client-ipc-msg-injector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/sof/sof-client-ipc-msg-injector.c b/sound/soc/sof/sof-client-ipc-msg-injector.c
index bce103da4c49..dba6cfd7db09 100644
--- a/sound/soc/sof/sof-client-ipc-msg-injector.c
+++ b/sound/soc/sof/sof-client-ipc-msg-injector.c
@@ -137,7 +137,7 @@ static int sof_msg_inject_probe(struct auxiliary_device *auxdev,
 		return -ENOMEM;
 
 	priv->tx_buffer = devm_kmalloc(dev, SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
-	priv->rx_buffer = devm_kmalloc(dev, SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
+	priv->rx_buffer = devm_kzalloc(dev, SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
 	if (!priv->tx_buffer || !priv->rx_buffer)
 		return -ENOMEM;
 
-- 
2.35.3