pinctrl: samsung: Out-of-bounds access through DT aliases

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

Hi,

The Samsung pinctrl driver uses the "pinctrlN" alias from DT without performing
any validation on the returned index, which may lead to out-of-bounds accesses
in the SoC-specific samsung_pin_ctrl[] arrays:

drivers/pinctrl/samsung/pinctrl-samsung.c:samsung_pinctrl_get_soc_data():

        id = of_alias_get_id(node, "pinctrl");
        if (id < 0) {
                dev_err(&pdev->dev, "failed to get alias id\n");
                return ERR_PTR(-ENOENT);
        }
        ctrl = of_device_get_match_data(&pdev->dev);
        // FIXME out-of-bounds access, limit not known
        ctrl += id;

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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
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