linux-kernel - [PATCH] ASoC: SOF: imx-common: set sdev->pdata->hw

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Message-Id: <20250211225018.2642-1-laurentiumihalcea111@gmail.com>
Date: Tue, 11 Feb 2025 17:50:18 -0500
From: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>
To: Mark Brown <broonie@...nel.org>,
	Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Daniel Baluta <daniel.baluta@....com>
Cc: imx@...ts.linux.dev,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: SOF: imx-common: set sdev->pdata->hw_pdata after common is alloc'd

From: Laurentiu Mihalcea <laurentiu.mihalcea@....com>

'imx_unregister_action' uses 'sdev->pdata->hw_pdata' to fetch the pointer
to the common data structure. As such, if 'sdev->pdata->hw_pdata' is not
set before adding 'imx_unregister_action' to the devres list, we risk
derefrencing a NULL pointer if any of the calls between
'devm_add_action_or_reset' and 'sdev->pdata->hw_pdata = common' fails.

Set 'sdev->pdata->hw_pdata' to point to 'common' as soon as 'common' is
allocated.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
---
 sound/soc/sof/imx/imx-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/sof/imx/imx-common.c b/sound/soc/sof/imx/imx-common.c
index 82057af1436c..c3594815e60e 100644
--- a/sound/soc/sof/imx/imx-common.c
+++ b/sound/soc/sof/imx/imx-common.c
@@ -378,6 +378,7 @@ static int imx_probe(struct snd_sof_dev *sdev)
 	if (!common)
 		return dev_err_probe(sdev->dev, -ENOMEM,
 				     "failed to allocate common data\n");
+	sdev->pdata->hw_pdata = common;
 
 	common->ipc_dev = platform_device_register_data(sdev->dev, "imx-dsp",
 							PLATFORM_DEVID_NONE,
@@ -436,7 +437,6 @@ static int imx_probe(struct snd_sof_dev *sdev)
 	imx_dsp_set_data(common->ipc_handle, sdev);
 
 	sdev->num_cores = 1;
-	sdev->pdata->hw_pdata = common;
 	sdev->mailbox_bar = SOF_FW_BLK_TYPE_SRAM;
 	sdev->dsp_box.offset = get_chip_info(sdev)->ipc_info.boot_mbox_offset;
 
-- 
2.34.1