static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	struct nfc_llcp_local *local;
	u8 rw = 0;
	u16 miux = 0;
	u32 idx;
	int rc = 0;

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
	    (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
	     !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
	     !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
		return -EINVAL;

	if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
		rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);

		if (rw > LLCP_MAX_RW)
			return -EINVAL;
	}

	if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
		miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);

		if (miux > LLCP_MAX_MIUX)
			return -EINVAL;
	}

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	device_lock(&dev->dev);

	local = nfc_llcp_find_local(dev);
	if (!local) {
		nfc_put_device(dev);
		rc = -ENODEV;
		goto exit;
	}

	if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
		if (dev->dep_link_up) {
			rc = -EINPROGRESS;
			goto exit;
		}

		local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
	}

	if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
		local->rw = rw;

	if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
		local->miux = cpu_to_be16(miux);

exit:
	device_unlock(&dev->dev);

	nfc_put_device(dev);

	return rc;
}

The product dereferences a pointer that it expects to be valid but is NULL.