From nobody Thu Oct 2 03:27:35 2025 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AFB2E2580ED; Tue, 23 Sep 2025 02:38:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758595137; cv=none; b=QFXbtqxRwT79jCLCl8y3W+2kYtIVXyMZ85iVR69BHwgvQmUBfB3769HN+Pi0hyPkg/lslvZryakTWP2LkHUAE9SHvhYyWw4nd27o5+L4HRfzhzl1TSXBhzRdeipQSUzmT2zyx46OUQXoN4F9F4wubMFHHcD4dVkvWzHrh4XAFy0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758595137; c=relaxed/simple; bh=FRjm17X99obcxvnwsM+wwNCYZMqeHfNSAs0zNYnppFw=; h=From:To:Cc:Subject:Date:Message-Id; b=ijIV0Wc6agOpQW2xCi5M9XmVNNzrq88Dul+bAk9kRSrOsserkJ6BG4OWHdw4ARSaEYydBqm8KfZhXST+PJHCUVy3dJ04aiWXb+MmStXXZU/JLJ7r9j/RFDLEE5NcWPlgpJP9OB5ofCW/5Z81j5szfjEXCS2SZY3bMXvrt67viP8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from localhost.localdomain (unknown [202.112.113.212]) by APP-01 (Coremail) with SMTP id qwCowAC3DqElCNJonBhjBA--.6286S2; Tue, 23 Sep 2025 10:38:42 +0800 (CST) From: Ma Ke To: srini@kernel.org, lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com, pierre-louis.bossart@linux.dev Cc: linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Ma Ke , stable@vger.kernel.org Subject: [PATCH v3] ASoC: wcd934x: fix error handling in wcd934x_codec_parse_data() Date: Tue, 23 Sep 2025 10:38:28 +0800 Message-Id: <20250923023828.36647-1-make24@iscas.ac.cn> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: qwCowAC3DqElCNJonBhjBA--.6286S2 X-Coremail-Antispam: 1UD129KBjvJXoWxXFy5JFy7JFWUJr47GryUKFg_yoW5Aw1fp3 yDCFWYgrZ8GrnF9r4SyrW8Aa4IkrW093WfAr48K34I9ws0kry7KFy0q3WYqFZ3tFWfJF1U Xry7Zr18CF4UZaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPF14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26ryj6F1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4j 6r4UJwA2z4x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v26F 4UJVW0owAac4AC62xK8xCEY4vEwIxC4wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40E FcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr 0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8v x2IErcIFxwACI402YVCY1x02628vn2kIc2xKxwCY1x0262kKe7AKxVWUtVW8ZwCY02Avz4 vE14v_Gr1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG 67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MI IYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E 14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJV W8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUOTmh UUUUU X-CM-SenderInfo: ppdnvj2u6l2u1dvotugofq/ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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 --- Changes in v3: - added a wrapper function due to the warning report from kernel test robot; Changes in v2: - modified the handling in the success path and fixed the memory leak for r= egmap as suggestions. --- sound/soc/codecs/wcd934x.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c index 1bb7e1dc7e6b..d9d8cf64977a 100644 --- a/sound/soc/codecs/wcd934x.c +++ b/sound/soc/codecs/wcd934x.c @@ -5831,6 +5831,15 @@ static const struct snd_soc_component_driver wcd934x= _component_drv =3D { .endianness =3D 1, }; =20 +static void wcd934x_put_device_action(void *data) +{ + struct device *dev =3D data; + + if (dev) { + put_device(dev); + } +} + static int wcd934x_codec_parse_data(struct wcd934x_codec *wcd) { struct device *dev =3D &wcd->sdev->dev; @@ -5847,11 +5856,13 @@ static int wcd934x_codec_parse_data(struct wcd934x_= codec *wcd) return dev_err_probe(dev, -EINVAL, "Unable to get SLIM Interface device\= n"); =20 slim_get_logical_addr(wcd->sidev); - wcd->if_regmap =3D regmap_init_slimbus(wcd->sidev, + wcd->if_regmap =3D 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"); + } =20 of_property_read_u32(dev->parent->of_node, "qcom,dmic-sample-rate", &wcd->dmic_sample_rate); @@ -5893,6 +5904,10 @@ static int wcd934x_codec_probe(struct platform_devic= e *pdev) if (ret) return ret; =20 + ret =3D devm_add_action_or_reset(dev, wcd934x_put_device_action, &wcd->si= dev->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, --=20 2.17.1