ACPICA: Properly handle NULL entries in _PRT return packages.

This change enables proper handling of NULL package entries in a _PRT
return value, during construction of the PCI routing table.
Lv Zheng.

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>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/acpi/acpica/rscreate.c b/drivers/acpi/acpica/rscreate.c
index ca62804178bd..f4cd6cad6607 100644
--- a/drivers/acpi/acpica/rscreate.c
+++ b/drivers/acpi/acpica/rscreate.c
@@ -292,7 +292,7 @@ acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
                 /* 1) First subobject: Dereference the PRT.Address */
 
                 obj_desc = sub_object_list[0];
-                if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
+                if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
                         ACPI_ERROR((AE_INFO,
                                     "(PRT[%u].Address) Need Integer, found %s",
                                     index,
@@ -305,7 +305,7 @@ acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
                 /* 2) Second subobject: Dereference the PRT.Pin */
 
                 obj_desc = sub_object_list[1];
-                if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
+                if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
                         ACPI_ERROR((AE_INFO,
                                     "(PRT[%u].Pin) Need Integer, found %s",
                                     index,
@@ -394,7 +394,7 @@ acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
                 /* 4) Fourth subobject: Dereference the PRT.source_index */
 
                 obj_desc = sub_object_list[3];
-                if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
+                if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
                         ACPI_ERROR((AE_INFO,
                                     "(PRT[%u].SourceIndex) Need Integer, found %s",
                                     index,