From 3e4ab747efa8e78562ec6782b08bbf21a00aba1b Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 23 Feb 2008 15:23:55 -0800
Subject: [PATCH] futex: fix init order
When the futex init code fails to initialize the futex pseudo file system it
returns early without initializing the hash queues. Should the boot succeed
then a futex syscall which tries to enqueue a waiter on the hashqueue will
crash due to the unitilialized plist heads.
Initialize the hash queues before the filesystem.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Riku Voipio <riku.voipio@movial.fi>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
kernel/futex.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c
index 221f2128a437..c21f667c63f6 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2145,8 +2145,14 @@ static struct file_system_type futex_fs_type = {
static int __init init(void)
{
- int i = register_filesystem(&futex_fs_type);
+ int i;
+ for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
+ plist_head_init(&futex_queues[i].chain, &futex_queues[i].lock);
+ spin_lock_init(&futex_queues[i].lock);
+ }
+
+ i = register_filesystem(&futex_fs_type);
if (i)
return i;
@@ -2156,10 +2162,6 @@ static int __init init(void)
return PTR_ERR(futex_mnt);
}
- for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
- plist_head_init(&futex_queues[i].chain, &futex_queues[i].lock);
- spin_lock_init(&futex_queues[i].lock);
- }
return 0;
}
__initcall(init);
--
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