ACPICA: Resource Mgr: Small fix for buffer size calculation

Fixes a one byte error in the output buffer calculation.
Feng Tang - ACPICA BZ 849:
https://www.acpica.org/bugzilla/show_bug.cgi?id=849

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/rscalc.c b/drivers/acpi/acpica/rscalc.c
index 685177985509..147feb6aa2a0 100644
--- a/drivers/acpi/acpica/rscalc.c
+++ b/drivers/acpi/acpica/rscalc.c
@@ -457,6 +457,15 @@ acpi_rs_get_list_length(u8 * aml_buffer,
                          * Get the number of vendor data bytes
                          */
                         extra_struct_bytes = resource_length;
+
+                        /*
+                         * There is already one byte included in the minimum
+                         * descriptor size. If there are extra struct bytes,
+                         * subtract one from the count.
+                         */
+                        if (extra_struct_bytes) {
+                                extra_struct_bytes--;
+                        }
                         break;
 
                 case ACPI_RESOURCE_NAME_END_TAG: