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Message-ID: <20251124104908.15754-4-johan@kernel.org>
Date: Mon, 24 Nov 2025 11:49:07 +0100
From: Johan Hovold <johan@...nel.org>
To: Olivier Moysan <olivier.moysan@...s.st.com>,
Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
Mark Brown <broonie@...nel.org>
Cc: Liam Girdwood <lgirdwood@...il.com>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
linux-sound@...r.kernel.org,
linux-kernel@...r.kernel.org,
Johan Hovold <johan@...nel.org>,
Olivier Moysan <olivier.moysan@...com>,
stable@...r.kernel.org
Subject: [PATCH 3/4] ASoC: stm32: sai: fix OF node leak on probe
The reference taken to the sync provider OF node when probing the
platform device is currently only dropped if the set_sync() callback
fails during DAI probe.
Make sure to drop the reference on platform probe failures (e.g. probe
deferral) and on driver unbind.
This also avoids a potential use-after-free in case the DAI is ever
reprobed without first rebinding the platform driver.
Fixes: 5914d285f6b7 ("ASoC: stm32: sai: Add synchronization support")
Fixes: d4180b4c02e7 ("ASoC: stm32: sai: fix set_sync service")
Cc: Olivier Moysan <olivier.moysan@...com>
Cc: stable@...r.kernel.org # 4.16: d4180b4c02e7
Signed-off-by: Johan Hovold <johan@...nel.org>
---
sound/soc/stm/stm32_sai.c | 12 +++---------
sound/soc/stm/stm32_sai_sub.c | 23 ++++++++++++++++-------
2 files changed, 19 insertions(+), 16 deletions(-)
diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c
index 7065aeb0e524..00cf24ceca2d 100644
--- a/sound/soc/stm/stm32_sai.c
+++ b/sound/soc/stm/stm32_sai.c
@@ -138,7 +138,6 @@ static int stm32_sai_set_sync(struct stm32_sai_data *sai_client,
if (!pdev) {
dev_err(&sai_client->pdev->dev,
"Device not found for node %pOFn\n", np_provider);
- of_node_put(np_provider);
return -ENODEV;
}
@@ -147,21 +146,16 @@ static int stm32_sai_set_sync(struct stm32_sai_data *sai_client,
if (!sai_provider) {
dev_err(&sai_client->pdev->dev,
"SAI sync provider data not found\n");
- ret = -EINVAL;
- goto error;
+ return -EINVAL;
}
/* Configure sync client */
ret = stm32_sai_sync_conf_client(sai_client, synci);
if (ret < 0)
- goto error;
+ return ret;
/* Configure sync provider */
- ret = stm32_sai_sync_conf_provider(sai_provider, synco);
-
-error:
- of_node_put(np_provider);
- return ret;
+ return stm32_sai_sync_conf_provider(sai_provider, synco);
}
static int stm32_sai_get_parent_clk(struct stm32_sai_data *sai)
diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 7a005b4ad304..5ae4d2577f28 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -1586,7 +1586,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
dev_err(&pdev->dev,
"External synchro not supported\n");
of_node_put(args.np);
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_put_sync_provider;
}
sai->sync = SAI_SYNC_EXTERNAL;
@@ -1595,7 +1596,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
(sai->synci > (SAI_GCR_SYNCIN_MAX + 1))) {
dev_err(&pdev->dev, "Wrong SAI index\n");
of_node_put(args.np);
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_put_sync_provider;
}
if (of_property_match_string(args.np, "compatible",
@@ -1609,7 +1611,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
if (!sai->synco) {
dev_err(&pdev->dev, "Unknown SAI sub-block\n");
of_node_put(args.np);
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_put_sync_provider;
}
}
@@ -1619,13 +1622,15 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
of_node_put(args.np);
sai->sai_ck = devm_clk_get(&pdev->dev, "sai_ck");
- if (IS_ERR(sai->sai_ck))
- return dev_err_probe(&pdev->dev, PTR_ERR(sai->sai_ck),
- "Missing kernel clock sai_ck\n");
+ if (IS_ERR(sai->sai_ck)) {
+ ret = dev_err_probe(&pdev->dev, PTR_ERR(sai->sai_ck),
+ "Missing kernel clock sai_ck\n");
+ goto err_put_sync_provider;
+ }
ret = clk_prepare(sai->pdata->pclk);
if (ret < 0)
- return ret;
+ goto err_put_sync_provider;
if (STM_SAI_IS_F4(sai->pdata))
return 0;
@@ -1647,6 +1652,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
err_unprepare_pclk:
clk_unprepare(sai->pdata->pclk);
+err_put_sync_provider:
+ of_node_put(sai->np_sync_provider);
return ret;
}
@@ -1720,6 +1727,7 @@ static int stm32_sai_sub_probe(struct platform_device *pdev)
err_unprepare_pclk:
clk_unprepare(sai->pdata->pclk);
+ of_node_put(sai->np_sync_provider);
return ret;
}
@@ -1732,6 +1740,7 @@ static void stm32_sai_sub_remove(struct platform_device *pdev)
snd_dmaengine_pcm_unregister(&pdev->dev);
snd_soc_unregister_component(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+ of_node_put(sai->np_sync_provider);
}
static int stm32_sai_sub_suspend(struct device *dev)
--
2.51.2
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