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 76152aaa330b..96dc0eea7659 100644 --- a/drivers/regulator/max8907-regulator.c +++ b/drivers/regulator/max8907-regulator.c @@ -296,7 +296,10 @@ 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; @@ -333,14 +336,20 @@ 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)