diff options
| -rw-r--r-- | drivers/acpi/acpica/rslist.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/rslist.c b/drivers/acpi/acpica/rslist.c index e46efaa889cd..164c96e063c6 100644 --- a/drivers/acpi/acpica/rslist.c +++ b/drivers/acpi/acpica/rslist.c @@ -55,15 +55,21 @@ acpi_rs_convert_aml_to_resources(u8 * aml, aml_resource = ACPI_CAST_PTR(union aml_resource, aml); if (acpi_ut_get_resource_type(aml) == ACPI_RESOURCE_NAME_SERIAL_BUS) { - if (aml_resource->common_serial_bus.type > - AML_RESOURCE_MAX_SERIALBUSTYPE) { + + /* Avoid undefined behavior: member access within misaligned address */ + + struct aml_resource_common_serialbus common_serial_bus; + memcpy(&common_serial_bus, aml_resource, + sizeof(common_serial_bus)); + + if (common_serial_bus.type > AML_RESOURCE_MAX_SERIALBUSTYPE) { conversion_table = NULL; } else { /* This is an I2C, SPI, UART, or CSI2 serial_bus descriptor */ conversion_table = acpi_gbl_convert_resource_serial_bus_dispatch - [aml_resource->common_serial_bus.type]; + [common_serial_bus.type]; } } else { conversion_table = |