vop_query_offset(struct vop_vdev *vdev, unsigned long offset,
		 unsigned long *size, unsigned long *pa)
{
	struct vop_device *vpdev = vdev->vpdev;
	unsigned long start = MIC_DP_SIZE;
	int i;

	/*
	 * MMAP interface is as follows:
	 * offset				region
	 * 0x0					virtio device_page
	 * 0x1000				first vring
	 * 0x1000 + size of 1st vring		second vring
	 * ....
	 */
	if (!offset) {
		*pa = virt_to_phys(vpdev->hw_ops->get_dp(vpdev));
		*size = MIC_DP_SIZE;
		return 0;
	}

	for (i = 0; i < vdev->dd->num_vq; i++) {
		struct vop_vringh *vvr = &vdev->vvr[i];

		if (offset == start) {
			*pa = virt_to_phys(vvr->vring.va);
			*size = vvr->vring.len;
			return 0;
		}
		start += vvr->vring.len;
	}
	return -1;
}

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.