The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x 4e65bda8273c938039403144730923e77916a3d7 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025101306-ploy-alkalize-b950@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 4e65bda8273c938039403144730923e77916a3d7 Mon Sep 17 00:00:00 2001 From: Ma Ke make24@iscas.ac.cn Date: Tue, 23 Sep 2025 14:52:12 +0800 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() and add devm_add_action_or_reset() in the probe function, which ensures that the reference count of the device is correctly managed.
Memory leak in regmap_init_slimbus() as the allocated regmap is not released when the device is removed. Using devm_regmap_init_slimbus() instead of regmap_init_slimbus() to ensure automatic regmap cleanup on device removal.
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@vger.kernel.org Fixes: a61f3b4f476e ("ASoC: wcd934x: add support to wcd9340/wcd9341 codec") Signed-off-by: Ma Ke make24@iscas.ac.cn Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@oss.qualcomm.com Link: https://patch.msgid.link/20250923065212.26660-1-make24@iscas.ac.cn Signed-off-by: Mark Brown broonie@kernel.org
diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c index 1bb7e1dc7e6b..e92939068bf7 100644 --- a/sound/soc/codecs/wcd934x.c +++ b/sound/soc/codecs/wcd934x.c @@ -5831,6 +5831,13 @@ static const struct snd_soc_component_driver wcd934x_component_drv = { .endianness = 1, };
+static void wcd934x_put_device_action(void *data) +{ + struct device *dev = data; + + put_device(dev); +} + static int wcd934x_codec_parse_data(struct wcd934x_codec *wcd) { struct device *dev = &wcd->sdev->dev; @@ -5847,11 +5854,13 @@ static int wcd934x_codec_parse_data(struct wcd934x_codec *wcd) return dev_err_probe(dev, -EINVAL, "Unable to get SLIM Interface device\n");
slim_get_logical_addr(wcd->sidev); - wcd->if_regmap = regmap_init_slimbus(wcd->sidev, + wcd->if_regmap = devm_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"); + }
of_property_read_u32(dev->parent->of_node, "qcom,dmic-sample-rate", &wcd->dmic_sample_rate); @@ -5893,6 +5902,10 @@ static int wcd934x_codec_probe(struct platform_device *pdev) if (ret) return ret;
+ ret = devm_add_action_or_reset(dev, wcd934x_put_device_action, &wcd->sidev->dev); + if (ret) + return ret; + /* set default rate 9P6MHz */ regmap_update_bits(wcd->regmap, WCD934X_CODEC_RPM_CLK_MCLK_CFG, WCD934X_CODEC_RPM_CLK_MCLK_CFG_MCLK_MASK,