From: Yizhuo yzhai003@ucr.edu
[ Upstream commit 1252b283141f03c3dffd139292c862cae10e174d ]
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@ucr.edu Link: https://lore.kernel.org/r/20190929170957.14775-1-yzhai003@ucr.edu Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 df5df1c495adb..689537927f6f7 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) {