linux-kernel - [PATCH] ASoC: wcd934x: fix error handling in wcd934x_codec_parse

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Message-Id: <20250921095927.28065-1-make24@iscas.ac.cn>
Date: Sun, 21 Sep 2025 17:59:27 +0800
From: Ma Ke <make24@...as.ac.cn>
To: srini@...nel.org,
	lgirdwood@...il.com,
	broonie@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com,
	pierre-louis.bossart@...ux.dev
Cc: linux-sound@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	Ma Ke <make24@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH] ASoC: wcd934x: fix error handling in wcd934x_codec_parse_data()

wcd934x_codec_parse_data() contains a device reference count leak in
of_slim_get_device() where device_find_child() increases the reference
count of the device but this reference is not properly decreased in
the success path. Add put_device() in wcd934x_codec_parse_data(),
which ensures that the reference count of the device is correctly
managed.

Calling path: of_slim_get_device() -> of_find_slim_device() ->
device_find_child(). As comment of device_find_child() says, 'NOTE:
you will need to drop the reference with put_device() after use.'.

Found by code review.

Cc: stable@...r.kernel.org
Fixes: a61f3b4f476e ("ASoC: wcd934x: add support to wcd9340/wcd9341 codec")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
 sound/soc/codecs/wcd934x.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c
index 1bb7e1dc7e6b..9ffa65329934 100644
--- a/sound/soc/codecs/wcd934x.c
+++ b/sound/soc/codecs/wcd934x.c
@@ -5849,10 +5849,13 @@ static int wcd934x_codec_parse_data(struct wcd934x_codec *wcd)
 	slim_get_logical_addr(wcd->sidev);
 	wcd->if_regmap = regmap_init_slimbus(wcd->sidev,
 				  &wcd934x_ifc_regmap_config);
-	if (IS_ERR(wcd->if_regmap))
+	if (IS_ERR(wcd->if_regmap)) {
+		put_device(&wcd->sidev->dev);
 		return dev_err_probe(dev, PTR_ERR(wcd->if_regmap),
 				     "Failed to allocate ifc register map\n");
+	}
 
+	put_device(&wcd->sidev->dev);
 	of_property_read_u32(dev->parent->of_node, "qcom,dmic-sample-rate",
 			     &wcd->dmic_sample_rate);
 
-- 
2.17.1