regulator: 88pm8607 - fix value range checking for accessing info->vol_table

In choose_voltage(), we use i as array index of info->vol_table.
The valid value range for i should be 0 .. ARRAY_SIZE(info->vol_table) - 1.

Take LDO1 as example, ARRAY_SIZE(LDO1_table) is 4, vol_nbits of LDO1 is 2.
for (i = 0; i < (2 << info->vol_nbits); i++)  is equivalent to
for (i = 0; i < 8; i++)
which is wrong.

The same value range checking also applies for index in pm8607_list_voltage().

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Mark Brown <broonie@openource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/drivers/regulator/88pm8607.c b/drivers/regulator/88pm8607.c
index 7d149a8..2ce2eb7 100644 (file)
--- a/drivers/regulator/88pm8607.c
+++ b/drivers/regulator/88pm8607.c
@@ -215,7 +215,7 @@ static int pm8607_list_voltage(struct regulator_dev *rdev, unsigned index)
        struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
        int ret = -EINVAL;
 
-       if (info->vol_table && (index < (2 << info->vol_nbits))) {
+       if (info->vol_table && (index < (1 << info->vol_nbits))) {
                ret = info->vol_table[index];
                if (info->slope_double)
                        ret <<= 1;
@@ -233,7 +233,7 @@ static int choose_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
                max_uV = max_uV >> 1;
        }
        if (info->vol_table) {
-               for (i = 0; i < (2 << info->vol_nbits); i++) {
+               for (i = 0; i < (1 << info->vol_nbits); i++) {
                        if (!info->vol_table[i])
                                break;
                        if ((min_uV <= info->vol_table[i])