Code: static inline void __file_sb_list_add(struct file *file, struct super_block *sb)
{
	struct list_head *list;
#ifdef CONFIG_SMP
	int cpu;
	cpu = smp_processor_id();
	file->f_sb_list_cpu = cpu;
	list = per_cpu_ptr(sb->s_files, cpu);
#else
	list = &sb->s_files;
#endif
	list_add(&file->f_u.fu_list, list);
}

Vulnerability Type: DoS 
CWE ID: CWE-17
Summary: The filesystem implementation in the Linux kernel before 3.13 performs certain operations on lists of files with an inappropriate locking approach, which allows local users to cause a denial of service (soft lockup or system crash) via unspecified use of Asynchronous I/O (AIO) operations.
Commit Message: get rid of s_files and files_lock

The only thing we need it for is alt-sysrq-r (emergency remount r/o)
and these days we can do just as well without going through the
list of files.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>