linux-kernel - [PATCH] regulator: pfuze100-regulator: Variable "val" in pfuze100_regulator

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Message-Id: <20190929170957.14775-1-yzhai003@ucr.edu>
Date:   Sun, 29 Sep 2019 10:09:57 -0700
From:   Yizhuo <yzhai003@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     csong@...ucr.edu, zhiyunq@...ucr.edu, Yizhuo <yzhai003@....edu>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] regulator: pfuze100-regulator: Variable "val" in pfuze100_regulator_probe() could be uninitialized

In function pfuze100_regulator_probe(), variable "val" could be
initialized if regmap_read() fails. However, "val" is used to
decide the control flow later in the if statement, which is
potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 drivers/regulator/pfuze100-regulator.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
index df5df1c495ad..689537927f6f 100644
--- a/drivers/regulator/pfuze100-regulator.c
+++ b/drivers/regulator/pfuze100-regulator.c
@@ -788,7 +788,13 @@ static int pfuze100_regulator_probe(struct i2c_client *client,
 
 		/* SW2~SW4 high bit check and modify the voltage value table */
 		if (i >= sw_check_start && i <= sw_check_end) {
-			regmap_read(pfuze_chip->regmap, desc->vsel_reg, &val);
+			ret = regmap_read(pfuze_chip->regmap,
+						desc->vsel_reg, &val);
+			if (ret) {
+				dev_err(&client->dev, "Fails to read from the register.\n");
+				return ret;
+			}
+
 			if (val & sw_hi) {
 				if (pfuze_chip->chip_id == PFUZE3000 ||
 					pfuze_chip->chip_id == PFUZE3001) {
-- 
2.17.1