static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct uio_device *idev = vma->vm_private_data;
	struct page *page;
	unsigned long offset;

	int mi = uio_find_mem_index(vma);
	if (mi < 0)
		return VM_FAULT_SIGBUS;

	/*
	 * We need to subtract mi because userspace uses offset = N*PAGE_SIZE
	 * to use mem[N].
	 */
	offset = (vmf->pgoff - mi) << PAGE_SHIFT;

	if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL)
		page = virt_to_page(idev->info->mem[mi].addr + offset);
	else
		page = vmalloc_to_page((void *)(unsigned long)idev->info->mem[mi].addr + offset);
	get_page(page);
	vmf->page = page;
	return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.