dsa: add device tree bindings to register DSA switches

Hello Florian Fainelli,

The patch 5e95329b701c: "dsa: add device tree bindings to register DSA switches" from Mar 22, 2013, leads to the following static checker warning:

	net/dsa/dsa.c:669 dsa_of_probe()
	error: testing array offset 'port_index' after use.

net/dsa/dsa.c
644 port_index = be32_to_cpup(port_reg);
645
646 port_name = of_get_property(port, "label", NULL);
647 if (!port_name)
648 continue;
649

   650                          cd->port_dn[port_index] = port;
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Write.

651
652 cd->port_names[port_index] = kstrdup(port_name,
653 GFP_KERNEL);
654 if (!cd->port_names[port_index]) {
655 ret = -ENOMEM;
656 goto out_free_chip;
657 }
658
659 link = of_parse_phandle(port, "link", 0);
660
661 if (!strcmp(port_name, "dsa") && link &&
662 pd->nr_chips > 1) {
663 ret = dsa_of_setup_routing_table(pd, cd,
664 chip_index, port_index, link);
665 if (ret)
666 goto out_free_chip;
667 }
668
669 if (port_index = DSA_MAX_PORTS)

                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^

The write was out of bounds memory corruption. Oops. Too late.

670 break;
671 }

regards,
dan carpenter