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>
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@ -2145,8 +2145,14 @@ static struct file_system_type futex_fs_type = {
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static int __init init(void)
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{
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int i = register_filesystem(&futex_fs_type);
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int i;
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for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
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plist_head_init(&futex_queues[i].chain, &futex_queues[i].lock);
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spin_lock_init(&futex_queues[i].lock);
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}
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i = register_filesystem(&futex_fs_type);
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if (i)
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return i;
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@ -2156,10 +2162,6 @@ static int __init init(void)
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return PTR_ERR(futex_mnt);
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}
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for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
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plist_head_init(&futex_queues[i].chain, &futex_queues[i].lock);
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spin_lock_init(&futex_queues[i].lock);
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}
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return 0;
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}
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__initcall(init);
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