1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 05550ba44d32..6d5a6cda0734 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -360,7 +360,8 @@ static int __init acpi_parse_apic_instance(char *str)
         if (!str)
                 return -EINVAL;
 
-        acpi_apic_instance = simple_strtoul(str, NULL, 0);
+        if (kstrtoint(str, 0, &acpi_apic_instance))
+                return -EINVAL;
 
         pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);