linux-kernel - [PATCH] In function rt274_i2c_probe(), if the regmap_read fails. The variable "val" could leave uninitialized but used in if statement.

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Message-Id: <20190103023839.15314-1-yzhai003@ucr.edu>
Date:   Wed,  2 Jan 2019 18:38:39 -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] In function rt274_i2c_probe(), if the regmap_read fails. The variable "val" could leave uninitialized but used in if statement.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 sound/soc/codecs/rt274.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/rt274.c b/sound/soc/codecs/rt274.c
index 8f92e5c4dd9d..940658cac063 100644
--- a/sound/soc/codecs/rt274.c
+++ b/sound/soc/codecs/rt274.c
@@ -1113,7 +1113,7 @@ static int rt274_i2c_probe(struct i2c_client *i2c,
 	struct rt274_priv *rt274;
 
 	int ret;
-	unsigned int val;
+	unsigned int val = ~0;
 
 	rt274 = devm_kzalloc(&i2c->dev,	sizeof(*rt274),
 				GFP_KERNEL);
@@ -1128,9 +1128,9 @@ static int rt274_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
-	regmap_read(rt274->regmap,
+	ret = regmap_read(rt274->regmap,
 		RT274_GET_PARAM(AC_NODE_ROOT, AC_PAR_VENDOR_ID), &val);
-	if (val != RT274_VENDOR_ID) {
+	if (ret || val != RT274_VENDOR_ID) {
 		dev_err(&i2c->dev,
 			"Device with ID register %#x is not rt274\n", val);
 		return -ENODEV;
-- 
2.17.1