From 5479c78ac6f688ea5ea8c49b44cf90ea87b63931 Mon Sep 17 00:00:00 2001
From: Cyrill Gorcunov <gorcunov@openvz.org>
Date: Sun, 25 Nov 2012 01:17:13 +0400
Subject: mm, percpu: Make sure percpu_alloc early parameter has an argument
Otherwise we are getting a nil dereference if percpu_alloc kernel boot
argument is specified without value.
| [ 0.000000] BUG: unable to handle kernel NULL pointer dereference at (null)
| [ 0.000000] IP: [<ffffffff81391360>] strcmp+0x10/0x30
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
---
mm/percpu.c | 3 +++
1 file changed, 3 insertions(+)
(limited to 'mm')
diff --git a/mm/percpu.c b/mm/percpu.c
index ec2589616e7d..8c8e08f3a692 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1380,6 +1380,9 @@ enum pcpu_fc pcpu_chosen_fc __initdata = PCPU_FC_AUTO;
static int __init percpu_alloc_setup(char *str)
{
+ if (!str)
+ return -EINVAL;
+
if (0)
/* nada */;
#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
--
cgit