diff options
Diffstat (limited to 'drivers/acpi/utilities/utresrc.c')
| -rw-r--r-- | drivers/acpi/utilities/utresrc.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/acpi/utilities/utresrc.c b/drivers/acpi/utilities/utresrc.c index 36bf9e4bf52..16461317113 100644 --- a/drivers/acpi/utilities/utresrc.c +++ b/drivers/acpi/utilities/utresrc.c @@ -486,6 +486,7 @@ u32 acpi_ut_get_descriptor_length(void *aml) * RETURN: Status, pointer to the end tag * * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template + * Note: allows a buffer length of zero. * ******************************************************************************/ @@ -504,6 +505,13 @@ acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc, aml = obj_desc->buffer.pointer; end_aml = aml + obj_desc->buffer.length; + /* Allow a buffer length of zero */ + + if (!obj_desc->buffer.length) { + *end_tag = aml; + return_ACPI_STATUS(AE_OK); + } + /* Walk the resource template, one descriptor per iteration */ while (aml < end_aml) { @@ -518,6 +526,14 @@ acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc, if (acpi_ut_get_resource_type(aml) == ACPI_RESOURCE_NAME_END_TAG) { + /* + * There must be at least one more byte in the buffer for + * the 2nd byte of the end_tag + */ + if ((aml + 1) >= end_aml) { + return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); + } + /* Return the pointer to the end_tag */ *end_tag = aml; |