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Merge branch 'acpica-fixes'

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* acpica-fixes:
  ACPICA: Fix handling of buffer-size in acpi_ex_write_data_to_field()
This commit is contained in:
Rafael J. Wysocki 2018-11-29 21:21:39 +01:00
commit c4f7842682
1 changed files with 2 additions and 19 deletions
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21
drivers/acpi/acpica/exserial.c
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@ -244,7 +244,6 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
{ {
acpi_status status; acpi_status status;
u32 buffer_length; u32 buffer_length;
u32 data_length;
void *buffer; void *buffer;
union acpi_operand_object *buffer_desc; union acpi_operand_object *buffer_desc;
u32 function; u32 function;
@ -282,14 +281,12 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
case ACPI_ADR_SPACE_SMBUS: case ACPI_ADR_SPACE_SMBUS:
buffer_length = ACPI_SMBUS_BUFFER_SIZE; buffer_length = ACPI_SMBUS_BUFFER_SIZE;
data_length = ACPI_SMBUS_DATA_SIZE;
function = ACPI_WRITE | (obj_desc->field.attribute << 16); function = ACPI_WRITE | (obj_desc->field.attribute << 16);
break; break;
case ACPI_ADR_SPACE_IPMI: case ACPI_ADR_SPACE_IPMI:
buffer_length = ACPI_IPMI_BUFFER_SIZE; buffer_length = ACPI_IPMI_BUFFER_SIZE;
data_length = ACPI_IPMI_DATA_SIZE;
function = ACPI_WRITE; function = ACPI_WRITE;
break; break;
@ -310,7 +307,6 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
/* Add header length to get the full size of the buffer */ /* Add header length to get the full size of the buffer */
buffer_length += ACPI_SERIAL_HEADER_SIZE; buffer_length += ACPI_SERIAL_HEADER_SIZE;
data_length = source_desc->buffer.pointer[1];
function = ACPI_WRITE | (accessor_type << 16); function = ACPI_WRITE | (accessor_type << 16);
break; break;
@ -318,20 +314,6 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID); return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
} }
#if 0
OBSOLETE ?
/* Check for possible buffer overflow */
if (data_length > source_desc->buffer.length) {
ACPI_ERROR((AE_INFO,
"Length in buffer header (%u)(%u) is greater than "
"the physical buffer length (%u) and will overflow",
data_length, buffer_length,
source_desc->buffer.length));
return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
}
#endif
/* Create the transfer/bidirectional/return buffer */ /* Create the transfer/bidirectional/return buffer */
buffer_desc = acpi_ut_create_buffer_object(buffer_length); buffer_desc = acpi_ut_create_buffer_object(buffer_length);
@ -342,7 +324,8 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
/* Copy the input buffer data to the transfer buffer */ /* Copy the input buffer data to the transfer buffer */
buffer = buffer_desc->buffer.pointer; buffer = buffer_desc->buffer.pointer;
memcpy(buffer, source_desc->buffer.pointer, data_length); memcpy(buffer, source_desc->buffer.pointer,
min(buffer_length, source_desc->buffer.length));
/* Lock entire transaction if requested */ /* Lock entire transaction if requested */