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 c3419182c9a72fd033b765f1d48e4ea14c11256c..775c97a282bd0d036bdcee72e192d502e8ba08ea 100644 (file)
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -300,6 +300,8 @@ int __init acpi_table_init(void)
 
 static int __init acpi_parse_apic_instance(char *str)
 {
+       if (!str)
+               return -EINVAL;
 
        acpi_apic_instance = simple_strtoul(str, NULL, 0);