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regulator: core: validate selector against linear_min_sel

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There are regulators who's min selector is not zero. Selectors loops
(looping b/w zero and regulator::desc::n_voltages) might throw errors
because invalid selectors are used (lower than
regulator::desc::linear_min_sel). For this situations validate selectors
against regulator::desc::linear_min_sel.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1605280870-32432-2-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Claudiu Beznea 2020-11-13 17:21:05 +02:00 committed by Mark Brown
parent 842f44806e
commit bdcd117757
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GPG Key ID: 24D68B725D5487D0
2 changed files with 9 additions and 3 deletions
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9
drivers/regulator/core.c
View File

@ -2958,7 +2958,8 @@ static int _regulator_list_voltage(struct regulator_dev *rdev,
return rdev->desc->fixed_uV;
if (ops->list_voltage) {
if (selector >= rdev->desc->n_voltages)
if (selector >= rdev->desc->n_voltages ||
selector < rdev->desc->linear_min_sel)
return -EINVAL;
if (lock)
regulator_lock(rdev);
@ -3109,7 +3110,8 @@ int regulator_list_hardware_vsel(struct regulator *regulator,
struct regulator_dev *rdev = regulator->rdev;
const struct regulator_ops *ops = rdev->desc->ops;
if (selector >= rdev->desc->n_voltages)
if (selector >= rdev->desc->n_voltages ||
selector < rdev->desc->linear_min_sel)
return -EINVAL;
if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
return -EOPNOTSUPP;
@ -4032,6 +4034,9 @@ int regulator_set_voltage_time(struct regulator *regulator,
for (i = 0; i < rdev->desc->n_voltages; i++) {
/* We only look for exact voltage matches here */
if (i < rdev->desc->linear_min_sel)
continue;
voltage = regulator_list_voltage(regulator, i);
if (voltage < 0)
return -EINVAL;

3
drivers/regulator/helpers.c
View File

@ -647,7 +647,8 @@ int regulator_list_voltage_table(struct regulator_dev *rdev,
return -EINVAL;
}
if (selector >= rdev->desc->n_voltages)
if (selector >= rdev->desc->n_voltages ||
selector < rdev->desc->linear_min_sel)
return -EINVAL;
return rdev->desc->volt_table[selector];