[PATCH 4.9 023/171] regulator: max8907: Fix the usage of uninitialized variable in max8907_regulator_probe()

Greg Kroah-Hartman
2020-01-02T22:48:42Z

From: Yizhuo <yzhai003@ucr.edu>

[ Upstream commit 472b39c3d1bba0616eb0e9a8fa3ad0f56927c7d7 ]

Inside function max8907_regulator_probe(), variable val could
be uninitialized if regmap_read() fails. However, val is used
later in the if statement to decide the content written to
"pmic", which is potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@ucr.edu>
Link: https://lore.kernel.org/r/20191003175813.16415-1-yzhai003@ucr.edu
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/regulator/max8907-regulator.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/max8907-regulator.c b/drivers/regulator/max8907-regulator.c
index 5e941db5ccaf..c7e70cfb581f 100644
--- a/drivers/regulator/max8907-regulator.c
+++ b/drivers/regulator/max8907-regulator.c
@@ -299,7 +299,10 @@ static int max8907_regulator_probe(struct platform_device *pdev)
memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc));

/* Backwards compatibility with MAX8907B; SD1 uses different voltages */
- regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
+ ret = regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
+ if (ret)
+ return ret;
+
if ((val & MAX8907_II2RR_VERSION_MASK) ==
MAX8907_II2RR_VERSION_REV_B) {
pmic->desc[MAX8907_SD1].min_uV = 637500;
@@ -336,14 +339,20 @@ static int max8907_regulator_probe(struct platform_device *pdev)
}

if (pmic->desc[i].ops == &max8907_ldo_ops) {
- regmap_read(config.regmap, pmic->desc[i].enable_reg,
+ ret = regmap_read(config.regmap, pmic->desc[i].enable_reg,
&val);
+ if (ret)
+ return ret;
+
if ((val & MAX8907_MASK_LDO_SEQ) !=
MAX8907_MASK_LDO_SEQ)
pmic->desc[i].ops = &max8907_ldo_hwctl_ops;
} else if (pmic->desc[i].ops == &max8907_out5v_ops) {
- regmap_read(config.regmap, pmic->desc[i].enable_reg,
+ ret = regmap_read(config.regmap, pmic->desc[i].enable_reg,
&val);
+ if (ret)
+ return ret;
+
if ((val & (MAX8907_MASK_OUT5V_VINEN |
MAX8907_MASK_OUT5V_ENSRC)) !=
MAX8907_MASK_OUT5V_ENSRC)
--
2.20.1