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smbus: fix invalid memory access in read_word()

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read_word() expected 3 bytes (uint16_t + PEC byte), but was passed an
address to an uint16_t value.

write_word() is changed to be type-safe as well.
This commit is contained in:
Beat Küng
2019-11-07 10:56:27 +01:00
parent e772ddf012
commit 32359168d6
3 changed files with 44 additions and 49 deletions
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src/drivers/batt_smbus/batt_smbus.cpp
+24 -29
View File
@@ -174,7 +174,7 @@ void BATT_SMBUS::Run()
// Temporary variable for storing SMBUS reads.
uint16_t result;
int ret = _interface->read_word(BATT_SMBUS_VOLTAGE, &result);
int ret = _interface->read_word(BATT_SMBUS_VOLTAGE, result);
ret |= get_cell_voltages();
@@ -183,13 +183,13 @@ void BATT_SMBUS::Run()
new_report.voltage_filtered_v = new_report.voltage_v;
// Read current.
ret |= _interface->read_word(BATT_SMBUS_CURRENT, &result);
ret |= _interface->read_word(BATT_SMBUS_CURRENT, result);
new_report.current_a = (-1.0f * ((float)(*(int16_t *)&result)) / 1000.0f);
new_report.current_filtered_a = new_report.current_a;
// Read average current.
ret |= _interface->read_word(BATT_SMBUS_AVERAGE_CURRENT, &result);
ret |= _interface->read_word(BATT_SMBUS_AVERAGE_CURRENT, result);
float average_current = (-1.0f * ((float)(*(int16_t *)&result)) / 1000.0f);
@@ -200,15 +200,15 @@ void BATT_SMBUS::Run()
set_undervoltage_protection(average_current);
// Read run time to empty.
ret |= _interface->read_word(BATT_SMBUS_RUN_TIME_TO_EMPTY, &result);
ret |= _interface->read_word(BATT_SMBUS_RUN_TIME_TO_EMPTY, result);
new_report.run_time_to_empty = result;
// Read average time to empty.
ret |= _interface->read_word(BATT_SMBUS_AVERAGE_TIME_TO_EMPTY, &result);
ret |= _interface->read_word(BATT_SMBUS_AVERAGE_TIME_TO_EMPTY, result);
new_report.average_time_to_empty = result;
// Read remaining capacity.
ret |= _interface->read_word(BATT_SMBUS_REMAINING_CAPACITY, &result);
ret |= _interface->read_word(BATT_SMBUS_REMAINING_CAPACITY, result);
// Calculate remaining capacity percent with complementary filter.
new_report.remaining = 0.8f * _last_report.remaining + 0.2f * (1.0f - (float)((float)(_batt_capacity - result) /
@@ -239,7 +239,7 @@ void BATT_SMBUS::Run()
}
// Read battery temperature and covert to Celsius.
ret |= _interface->read_word(BATT_SMBUS_TEMP, &result);
ret |= _interface->read_word(BATT_SMBUS_TEMP, result);
new_report.temperature = ((float)result / 10.0f) + CONSTANTS_ABSOLUTE_NULL_CELSIUS;
new_report.capacity = _batt_capacity;
@@ -287,19 +287,19 @@ int BATT_SMBUS::get_cell_voltages()
// Temporary variable for storing SMBUS reads.
uint16_t result = 0;
int ret = _interface->read_word(BATT_SMBUS_CELL_1_VOLTAGE, &result);
int ret = _interface->read_word(BATT_SMBUS_CELL_1_VOLTAGE, result);
// Convert millivolts to volts.
_cell_voltages[0] = ((float)result) / 1000.0f;
ret = _interface->read_word(BATT_SMBUS_CELL_2_VOLTAGE, &result);
ret = _interface->read_word(BATT_SMBUS_CELL_2_VOLTAGE, result);
// Convert millivolts to volts.
_cell_voltages[1] = ((float)result) / 1000.0f;
ret = _interface->read_word(BATT_SMBUS_CELL_3_VOLTAGE, &result);
ret = _interface->read_word(BATT_SMBUS_CELL_3_VOLTAGE, result);
// Convert millivolts to volts.
_cell_voltages[2] = ((float)result) / 1000.0f;
ret = _interface->read_word(BATT_SMBUS_CELL_4_VOLTAGE, &result);
ret = _interface->read_word(BATT_SMBUS_CELL_4_VOLTAGE, result);
// Convert millivolts to volts.
_cell_voltages[3] = ((float)result) / 1000.0f;
@@ -414,20 +414,17 @@ int BATT_SMBUS::get_startup_info()
_manufacturer_name = new char[sizeof(man_name)];
}
// Temporary variable for storing SMBUS reads.
uint16_t tmp = 0;
uint16_t serial_num;
result = _interface->read_word(BATT_SMBUS_SERIAL_NUMBER, serial_num);
result = _interface->read_word(BATT_SMBUS_SERIAL_NUMBER, &tmp);
uint16_t serial_num = tmp;
uint16_t remaining_cap;
result |= _interface->read_word(BATT_SMBUS_REMAINING_CAPACITY, remaining_cap);
result |= _interface->read_word(BATT_SMBUS_REMAINING_CAPACITY, &tmp);
uint16_t remaining_cap = tmp;
uint16_t cycle_count;
result |= _interface->read_word(BATT_SMBUS_CYCLE_COUNT, cycle_count);
result |= _interface->read_word(BATT_SMBUS_CYCLE_COUNT, &tmp);
uint16_t cycle_count = tmp;
result |= _interface->read_word(BATT_SMBUS_FULL_CHARGE_CAPACITY, &tmp);
uint16_t full_cap = tmp;
uint16_t full_cap;
result |= _interface->read_word(BATT_SMBUS_FULL_CHARGE_CAPACITY, full_cap);
if (!result) {
_serial_number = serial_num;
@@ -463,7 +460,7 @@ uint16_t BATT_SMBUS::get_serial_number()
{
uint16_t serial_num = 0;
if (_interface->read_word(BATT_SMBUS_SERIAL_NUMBER, &serial_num) == PX4_OK) {
if (_interface->read_word(BATT_SMBUS_SERIAL_NUMBER, serial_num) == PX4_OK) {
return serial_num;
}
@@ -472,10 +469,8 @@ uint16_t BATT_SMBUS::get_serial_number()
int BATT_SMBUS::manufacture_date()
{
uint16_t date = PX4_ERROR;
uint8_t code = BATT_SMBUS_MANUFACTURE_DATE;
int result = _interface->read_word(code, &date);
uint16_t date;
int result = _interface->read_word(BATT_SMBUS_MANUFACTURE_DATE, date);
if (result != PX4_OK) {
return result;
@@ -550,9 +545,9 @@ int BATT_SMBUS::unseal()
// See bq40z50 technical reference.
uint16_t keys[2] = {0x0414, 0x3672};
int ret = _interface->write_word(BATT_SMBUS_MANUFACTURER_ACCESS, &keys[0]);
int ret = _interface->write_word(BATT_SMBUS_MANUFACTURER_ACCESS, keys[0]);
ret |= _interface->write_word(BATT_SMBUS_MANUFACTURER_ACCESS, &keys[1]);
ret |= _interface->write_word(BATT_SMBUS_MANUFACTURER_ACCESS, keys[1]);
return ret;
}