[PATCH 1/9] serial: arc_uart: Fix out-of-bounds access through DT alias

[geert@xxxxxxxxxxxxxx (Geert Uytterhoeven)]

On Tue, Feb 20, 2018 at 10:40 AM, Geert Uytterhoeven
<geert+renesas at glider.be> wrote:
> The arc_uart_ports[] array is indexed using a value derived from the
> "serialN" alias in DT, which may lead to an out-of-bounds access.
>
> Fix this by adding a range check.
>
> Note that the array size is defined by a Kconfig symbol
> (CONFIG_SERIAL_ARC_NR_PORTS), so this can even be triggered using a
> legitimate DTB.
>
> Fixes: 10640deb04b7949a ("serial: arc_uart: Fix out-of-bounds access through DT alias")

Fixes: ea28fd56fcde69af ("serial/arc-uart: switch to devicetree based probing")

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds