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: