static int init_vqs(struct ports_device *portdev)
{
	vq_callback_t **io_callbacks;
	char **io_names;
	struct virtqueue **vqs;
	u32 i, j, nr_ports, nr_queues;
	int err;

	nr_ports = portdev->max_nr_ports;
	nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2;

	vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL);
	io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL);
	io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL);
	portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
				  GFP_KERNEL);
	portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
				   GFP_KERNEL);
	if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs ||
	    !portdev->out_vqs) {
		err = -ENOMEM;
		goto free;
	}

	/*
	 * For backward compat (newer host but older guest), the host
	 * spawns a console port first and also inits the vqs for port
	 * 0 before others.
	 */
	j = 0;
	io_callbacks[j] = in_intr;
	io_callbacks[j + 1] = out_intr;
	io_names[j] = "input";
	io_names[j + 1] = "output";
	j += 2;

	if (use_multiport(portdev)) {
		io_callbacks[j] = control_intr;
		io_callbacks[j + 1] = NULL;
		io_names[j] = "control-i";
		io_names[j + 1] = "control-o";

		for (i = 1; i < nr_ports; i++) {
			j += 2;
			io_callbacks[j] = in_intr;
			io_callbacks[j + 1] = out_intr;
			io_names[j] = "input";
			io_names[j + 1] = "output";
		}
	}
	/* Find the queues. */
	err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs,
					      io_callbacks,
					      (const char **)io_names, NULL);
	if (err)
		goto free;

	j = 0;
	portdev->in_vqs[0] = vqs[0];
	portdev->out_vqs[0] = vqs[1];
	j += 2;
	if (use_multiport(portdev)) {
		portdev->c_ivq = vqs[j];
		portdev->c_ovq = vqs[j + 1];

		for (i = 1; i < nr_ports; i++) {
			j += 2;
			portdev->in_vqs[i] = vqs[j];
			portdev->out_vqs[i] = vqs[j + 1];
		}
	}
	kfree(io_names);
	kfree(io_callbacks);
	kfree(vqs);

	return 0;

free:
	kfree(portdev->out_vqs);
	kfree(portdev->in_vqs);
	kfree(io_names);
	kfree(io_callbacks);
	kfree(vqs);

	return err;
}

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.