static int uio_mmap_physical(struct vm_area_struct *vma)
 {
 	struct uio_device *idev = vma->vm_private_data;
 	int mi = uio_find_mem_index(vma);
	struct uio_mem *mem;
 	if (mi < 0)
 		return -EINVAL;
	mem = idev->info->mem + mi;
 
	if (vma->vm_end - vma->vm_start > mem->size)
		return -EINVAL;
 
	vma->vm_ops = &uio_physical_vm_ops;
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 
	/*
	 * We cannot use the vm_iomap_memory() helper here,
	 * because vma->vm_pgoff is the map index we looked
	 * up above in uio_find_mem_index(), rather than an
	 * actual page offset into the mmap.
	 *
	 * So we just do the physical mmap without a page
	 * offset.
	 */
 	return remap_pfn_range(vma,
 			       vma->vm_start,
			       mem->addr >> PAGE_SHIFT,
 			       vma->vm_end - vma->vm_start,
 			       vma->vm_page_prot);
 }

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.