ACPICA: Add error checks to prevent faults

Added additional error checking to prevent run-time faults.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/acpi/namespace/nsnames.c b/drivers/acpi/namespace/nsnames.c
index cbd94af08cc5..e14a1412656b 100644
--- a/drivers/acpi/namespace/nsnames.c
+++ b/drivers/acpi/namespace/nsnames.c
@@ -180,6 +180,12 @@ acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
         next_node = node;
 
         while (next_node && (next_node != acpi_gbl_root_node)) {
+                if (ACPI_GET_DESCRIPTOR_TYPE(next_node) != ACPI_DESC_TYPE_NAMED) {
+                        ACPI_ERROR((AE_INFO,
+                                    "Invalid NS Node (%X) while traversing path",
+                                    next_node));
+                        return 0;
+                }
                 size += ACPI_PATH_SEGMENT_LENGTH;
                 next_node = acpi_ns_get_parent_node(next_node);
         }