From f0df2d6b52ad7db5edf56909509d51be66fe90be Mon Sep 17 00:00:00 2001
From: Cyrill Gorcunov <gorcunov@gmail.com>
Date: Wed, 20 Aug 2008 16:41:45 -0700
Subject: 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>
---
 drivers/acpi/tables.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'drivers/acpi/tables.c')

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index c3419182c9a7..775c97a282bd 100644
--- 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);
 
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