[patch 05/25] x86: idle process - add checking for NULL early param

[Greg KH <gregkh@suse.de>]

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2.6.26-stable review patch.  If anyone has any objections, please let us
know.

------------------

From: Cyrill Gorcunov <gorcunov@gmail.com>

[ Upstream commit ab6bc3e343fbe3be4a0f67225e849d0db6b4b7ac ]

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: akpm@linux-foundation.org
Cc: andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
CC: Oliver Pinter <oliver.pntr@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 arch/x86/kernel/process.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -164,6 +164,9 @@ void __cpuinit select_idle_routine(const
 
 static int __init idle_setup(char *str)
 {
+	if (!str)
+		return -EINVAL;
+
 	if (!strcmp(str, "poll")) {
 		printk("using polling idle threads.\n");
 		pm_idle = poll_idle;

--