diff options
author | Lv Zheng <lv.zheng@intel.com> | 2013-11-21 12:17:34 +0800 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-11-21 13:47:04 +0100 |
commit | 9a0a35972591f91167556b4a61673d08ef07f310 (patch) | |
tree | 81dc770c8618c8a8e5f6a147592cdd7a79b18565 /drivers/acpi/acpica/rscreate.c | |
parent | c38f671e390fe0d1605b402a28b01b1dbf8e10b3 (diff) | |
download | linux-9a0a35972591f91167556b4a61673d08ef07f310.tar.bz2 |
ACPICA: Resources: Fix loop termination for the get AML length function.
The loop terminates on a NULL resource pointer, which can never
happen since the loop simply increments a valid resource pointer.
This fix changes the loop to terminate on an end-of-buffer condition.
Problem can be seen by callers to AcpiSetCurrentResources with an
invalid or corrupted resource descriptor; or a resource descriptor
without an END_TAG descriptor.
(refined by Bob Moore)
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/rscreate.c')
-rw-r--r-- | drivers/acpi/acpica/rscreate.c | 36 |
1 files changed, 17 insertions, 19 deletions
diff --git a/drivers/acpi/acpica/rscreate.c b/drivers/acpi/acpica/rscreate.c index 65f3e1c5b598..3a2ace93e62c 100644 --- a/drivers/acpi/acpica/rscreate.c +++ b/drivers/acpi/acpica/rscreate.c @@ -418,22 +418,21 @@ acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object, * * FUNCTION: acpi_rs_create_aml_resources * - * PARAMETERS: linked_list_buffer - Pointer to the resource linked list - * output_buffer - Pointer to the user's buffer + * PARAMETERS: resource_list - Pointer to the resource list buffer + * output_buffer - Where the AML buffer is returned * * RETURN: Status AE_OK if okay, else a valid acpi_status code. * If the output_buffer is too small, the error will be * AE_BUFFER_OVERFLOW and output_buffer->Length will point * to the size buffer needed. * - * DESCRIPTION: Takes the linked list of device resources and - * creates a bytestream to be used as input for the - * _SRS control method. + * DESCRIPTION: Converts a list of device resources to an AML bytestream + * to be used as input for the _SRS control method. * ******************************************************************************/ acpi_status -acpi_rs_create_aml_resources(struct acpi_resource *linked_list_buffer, +acpi_rs_create_aml_resources(struct acpi_buffer *resource_list, struct acpi_buffer *output_buffer) { acpi_status status; @@ -441,16 +440,16 @@ acpi_rs_create_aml_resources(struct acpi_resource *linked_list_buffer, ACPI_FUNCTION_TRACE(rs_create_aml_resources); - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "LinkedListBuffer = %p\n", - linked_list_buffer)); + /* Params already validated, no need to re-validate here */ - /* - * Params already validated, so we don't re-validate here - * - * Pass the linked_list_buffer into a module that calculates - * the buffer size needed for the byte stream. - */ - status = acpi_rs_get_aml_length(linked_list_buffer, &aml_size_needed); + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ResourceList Buffer = %p\n", + resource_list->pointer)); + + /* Get the buffer size needed for the AML byte stream */ + + status = acpi_rs_get_aml_length(resource_list->pointer, + resource_list->length, + &aml_size_needed); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n", (u32)aml_size_needed, acpi_format_exception(status))); @@ -467,10 +466,9 @@ acpi_rs_create_aml_resources(struct acpi_resource *linked_list_buffer, /* Do the conversion */ - status = - acpi_rs_convert_resources_to_aml(linked_list_buffer, - aml_size_needed, - output_buffer->pointer); + status = acpi_rs_convert_resources_to_aml(resource_list->pointer, + aml_size_needed, + output_buffer->pointer); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } |