linux-kernel - [PATCH] ASoC: rt5651: Variable "ret" in function rt5651_i2c

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Message-Id: <20190125184537.13419-1-yzhai003@ucr.edu>
Date:   Fri, 25 Jan 2019 10:45:37 -0800
From:   Yizhuo <yzhai003@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     csong@...ucr.edu, zhiyunq@...ucr.edu, Yizhuo <yzhai003@....edu>,
        Bard Liao <bardliao@...ltek.com>,
        Oder Chiou <oder_chiou@...ltek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: rt5651: Variable "ret" in function rt5651_i2c_probe() could be uninitialized

In function rt5651_i2c_probe(), local variable "ret" could
be uninitialized if function regmap_read() returns -EINVAL.
However, this value is used in if statement. This is
potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 sound/soc/codecs/rt5651.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt5651.c b/sound/soc/codecs/rt5651.c
index da60b28ba3df..8d6cbc6b6ff0 100644
--- a/sound/soc/codecs/rt5651.c
+++ b/sound/soc/codecs/rt5651.c
@@ -1734,6 +1734,7 @@ static int rt5651_i2c_probe(struct i2c_client *i2c,
 	struct rt5651_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	struct rt5651_priv *rt5651;
 	int ret;
+	int err;
 
 	rt5651 = devm_kzalloc(&i2c->dev, sizeof(*rt5651),
 				GFP_KERNEL);
@@ -1755,7 +1756,10 @@ static int rt5651_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
-	regmap_read(rt5651->regmap, RT5651_DEVICE_ID, &ret);
+	err = regmap_read(rt5651->regmap, RT5651_DEVICE_ID, &ret);
+	if (err)
+		return err;
+
 	if (ret != RT5651_DEVICE_ID_VALUE) {
 		dev_err(&i2c->dev,
 			"Device with ID register %#x is not rt5651\n", ret);
-- 
2.17.1