ACPICA: Resource Mgr: Prevent infinite loops in resource walks

Add checks for zero-length resource descriptors in all code that
loops through a resource descriptor list. This prevents possible
infinite loops because the length is used to increment the traveral
pointer and detect the end-of-descriptor.

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, 8 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/rsdump.c b/drivers/acpi/acpica/rsdump.c
index cab51445189d..b5fc0db2e87b 100644
--- a/drivers/acpi/acpica/rsdump.c
+++ b/drivers/acpi/acpica/rsdump.c
@@ -385,6 +385,14 @@ void acpi_rs_dump_resource_list(struct acpi_resource *resource_list)
                         return;
                 }
 
+                /* Sanity check the length. It must not be zero, or we loop forever */
+
+                if (!resource_list->length) {
+                        acpi_os_printf
+                            ("Invalid zero length descriptor in resource list\n");
+                        return;
+                }
+
                 /* Dump the resource descriptor */
 
                 if (type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {