linux-kernel - [PATCH] ASoC: imx-audmix: check return value of devm

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Message-ID: <20230614121509.443926-1-claudiu.beznea@microchip.com>
Date:   Wed, 14 Jun 2023 15:15:09 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <shengjiu.wang@...il.com>, <Xiubo.Lee@...il.com>,
        <festevam@...il.com>, <nicoleotsuka@...il.com>,
        <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <shawnguo@...nel.org>, <s.hauer@...gutronix.de>,
        <kernel@...gutronix.de>, <linux-imx@....com>,
        <viorel.suman@....com>
CC:     <alsa-devel@...a-project.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH] ASoC: imx-audmix: check return value of devm_kasprintf()

devm_kasprintf() returns a pointer to dynamically allocated memory.
Pointer could be NULL in case allocation fails. Check pointer validity.
Identified with coccinelle (kmerr.cocci script).

Fixes: b86ef5367761 ("ASoC: fsl: Add Audio Mixer machine driver")
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---

Hi,

This has been addressed using kmerr.cocci script proposed for update
at [1].

Thank you,
Claudiu Beznea

[1] https://lore.kernel.org/all/20230530074044.1603426-1-claudiu.beznea@microchip.com/

 sound/soc/fsl/imx-audmix.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/fsl/imx-audmix.c b/sound/soc/fsl/imx-audmix.c
index 2c57fe9d2d08..af06268ee57b 100644
--- a/sound/soc/fsl/imx-audmix.c
+++ b/sound/soc/fsl/imx-audmix.c
@@ -228,6 +228,8 @@ static int imx_audmix_probe(struct platform_device *pdev)
 
 		dai_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s%s",
 					  fe_name_pref, args.np->full_name + 1);
+		if (!dai_name)
+			return -ENOMEM;
 
 		dev_info(pdev->dev.parent, "DAI FE name:%s\n", dai_name);
 
@@ -236,6 +238,8 @@ static int imx_audmix_probe(struct platform_device *pdev)
 			capture_dai_name =
 				devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s %s",
 					       dai_name, "CPU-Capture");
+			if (!capture_dai_name)
+				return -ENOMEM;
 		}
 
 		priv->dai[i].cpus = &dlc[0];
@@ -263,6 +267,8 @@ static int imx_audmix_probe(struct platform_device *pdev)
 				       "AUDMIX-Playback-%d", i);
 		be_cp = devm_kasprintf(&pdev->dev, GFP_KERNEL,
 				       "AUDMIX-Capture-%d", i);
+		if (!be_name || !be_pb || !be_cp)
+			return -ENOMEM;
 
 		priv->dai[num_dai + i].cpus = &dlc[2];
 		priv->dai[num_dai + i].codecs = &dlc[3];
@@ -287,6 +293,9 @@ static int imx_audmix_probe(struct platform_device *pdev)
 		priv->dapm_routes[i].source =
 			devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s %s",
 				       dai_name, "CPU-Playback");
+		if (!priv->dapm_routes[i].source)
+			return -ENOMEM;
+
 		priv->dapm_routes[i].sink = be_pb;
 		priv->dapm_routes[num_dai + i].source   = be_pb;
 		priv->dapm_routes[num_dai + i].sink     = be_cp;
-- 
2.34.1