> +int hugetlb_zero_setup(struct file *file, struct vm_area_struct *vma)
> +{
> + file = hugetlb_file_setup(vma->vm_end - vma->vm_start, 0);
> + if (IS_ERR(file))
> + return PTR_ERR(file);
> +
> + if (vma->vm_file)
> + fput(vma->vm_file);
> + vma->vm_file = file;
> + return hugetlbfs_file_mmap(file, vma);
> +}
Setting vma->vm_file to something that is not the file we called mmap
on and even refers to a different inode seems rather dangerous.
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