int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
			       u8 comm_mode, u8 rf_mode)
{
	struct sk_buff *msg;
	void *hdr;

	pr_debug("DEP link is up\n");

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
	if (!hdr)
		goto free_msg;

	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
		goto nla_put_failure;
	if (rf_mode == NFC_RF_INITIATOR &&
	    nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
		goto nla_put_failure;
	if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
	    nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
		goto nla_put_failure;

	genlmsg_end(msg, hdr);

	dev->dep_link_up = true;

	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);

	return 0;

nla_put_failure:
free_msg:
	nlmsg_free(msg);
	return -EMSGSIZE;
}

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