acpi: add checking for NULL early param
The early_param handling function could recieve NULL pointer as argument
in case if user didn't enter parameter value. So we have to be ready for
a such situation and do check for NULL pointer if needed.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index c341918..775c97a 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -300,6 +300,8 @@
static int __init acpi_parse_apic_instance(char *str)
{
+ if (!str)
+ return -EINVAL;
acpi_apic_instance = simple_strtoul(str, NULL, 0);
