phy-rcar-gen3-usb2: wrong parsing of role in role_store?

[Pavel Machek <pavel@denx.de>]

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Hi!

Code does strcmps, but does not actually check count. So AFAICT
writing "host-I-don't-want-I-need-peripheral" into the file will
succeed and turn it into host mode.

Also data beyond count in buf are going to be accessed.

Best regards,
								Pavel

static ssize_t role_store(struct device *dev, struct device_attribute *attr,
                          const char *buf, size_t count)
{
        struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
        bool is_b_device;
        enum phy_mode cur_mode, new_mode;

        if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
                return -EIO;

        /* FIXME, this is wrong */
        if (!strncmp(buf, "host", strlen("host")))
                new_mode = PHY_MODE_USB_HOST;
        else if (!strncmp(buf, "peripheral", strlen("peripheral")))
                new_mode = PHY_MODE_USB_DEVICE;
        else
                return -EINVAL;


-- 
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