hwmon: (ads1015) Fix out-of-bounds array access

commit e981429557cbe10c780fab1c1a237cb832757652 upstream.

Current code uses data_rate as array index in ads1015_read_adc() and uses pga
as array index in ads1015_reg_to_mv, so we must make sure both data_rate and
pga settings are in valid value range.
Return -EINVAL if the setting is out-of-range.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/hwmon/ads1015.c b/drivers/hwmon/ads1015.c
index c9780ae..2f14cad 100644 (file)
--- a/drivers/hwmon/ads1015.c
+++ b/drivers/hwmon/ads1015.c
@@ -200,6 +200,7 @@ static int ads1015_get_channels_config_of(struct i2c_client *client)
                                dev_err(&client->dev,
                                        "invalid gain on %s\n",
                                        node->full_name);
+                               return -EINVAL;
                        }
                }
 
@@ -210,6 +211,7 @@ static int ads1015_get_channels_config_of(struct i2c_client *client)
                                dev_err(&client->dev,
                                        "invalid data_rate on %s\n",
                                        node->full_name);
+                               return -EINVAL;
                        }
                }