From b8e4d89357fc434618a59c1047cac72641191805 Mon Sep 17 00:00:00 2001 From: Bob Moore Date: Fri, 27 Jan 2006 16:43:00 -0500 Subject: [ACPI] ACPICA 20060127 Implemented support in the Resource Manager to allow unresolved namestring references within resource package objects for the _PRT method. This support is in addition to the previously implemented unresolved reference support within the AML parser. If the interpreter slack mode is enabled (true on Linux unless acpi=strict), these unresolved references will be passed through to the caller as a NULL package entry. http://bugzilla.kernel.org/show_bug.cgi?id=5741 Implemented and deployed new macros and functions for error and warning messages across the subsystem. These macros are simpler and generate less code than their predecessors. The new macros ACPI_ERROR, ACPI_EXCEPTION, ACPI_WARNING, and ACPI_INFO replace the ACPI_REPORT_* macros. Implemented the acpi_cpu_flags type to simplify host OS integration of the Acquire/Release Lock OSL interfaces. Suggested by Steven Rostedt and Andrew Morton. Fixed a problem where Alias ASL operators are sometimes not correctly resolved. causing AE_AML_INTERNAL http://bugzilla.kernel.org/show_bug.cgi?id=5189 http://bugzilla.kernel.org/show_bug.cgi?id=5674 Fixed several problems with the implementation of the ConcatenateResTemplate ASL operator. As per the ACPI specification, zero length buffers are now treated as a single EndTag. One-length buffers always cause a fatal exception. Non-zero length buffers that do not end with a full 2-byte EndTag cause a fatal exception. Fixed a possible structure overwrite in the AcpiGetObjectInfo external interface. (With assistance from Thomas Renninger) Signed-off-by: Bob Moore Signed-off-by: Len Brown --- drivers/acpi/utilities/utresrc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'drivers/acpi/utilities/utresrc.c') diff --git a/drivers/acpi/utilities/utresrc.c b/drivers/acpi/utilities/utresrc.c index 36bf9e4bf529..16461317113f 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; -- cgit v1.2.3