Commit message: nfp: flower: fix memory leak in nfp_flower_spawn_vnic_reprs

In nfp_flower_spawn_vnic_reprs in the loop if initialization or the
allocations fail memory is leaked. Appropriate releases are added.

Fixes: b94524529741 ("nfp: flower: add per repr private data for LAG offload")
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
CVE: CVE-2019-19081
CWE: CWE-401
Vulnerability description: A memory leak in the nfp_flower_spawn_vnic_reprs() function in drivers/net/ethernet/netronome/nfp/flower/main.c in the Linux kernel before 5.3.4 allows attackers to cause a denial of service (memory consumption), aka CID-8ce39eb5a67a.

Project: linux
File: main.c

nfp_flower_spawn_vnic_reprs(struct nfp_app *app,
			    enum nfp_flower_cmsg_port_vnic_type vnic_type,
			    enum nfp_repr_type repr_type, unsigned int cnt)
{
	u8 nfp_pcie = nfp_cppcore_pcie_unit(app->pf->cpp);
	struct nfp_flower_priv *priv = app->priv;
	atomic_t *replies = &priv->reify_replies;
	struct nfp_flower_repr_priv *repr_priv;
	enum nfp_port_type port_type;
	struct nfp_repr *nfp_repr;
	struct nfp_reprs *reprs;
	int i, err, reify_cnt;
	const u8 queue = 0;

	port_type = repr_type == NFP_REPR_TYPE_PF ? NFP_PORT_PF_PORT :
						    NFP_PORT_VF_PORT;

	reprs = nfp_reprs_alloc(cnt);
	if (!reprs)
		return -ENOMEM;

	for (i = 0; i < cnt; i++) {
		struct net_device *repr;
		struct nfp_port *port;
		u32 port_id;

		repr = nfp_repr_alloc(app);
		if (!repr) {
			err = -ENOMEM;
			goto err_reprs_clean;
		}

		repr_priv = kzalloc(sizeof(*repr_priv), GFP_KERNEL);
		if (!repr_priv) {
			err = -ENOMEM;
			goto err_reprs_clean;
		}

		nfp_repr = netdev_priv(repr);
		nfp_repr->app_priv = repr_priv;
		repr_priv->nfp_repr = nfp_repr;

		/* For now we only support 1 PF */
		WARN_ON(repr_type == NFP_REPR_TYPE_PF && i);

		port = nfp_port_alloc(app, port_type, repr);
		if (IS_ERR(port)) {
			err = PTR_ERR(port);
			nfp_repr_free(repr);
			goto err_reprs_clean;
		}
		if (repr_type == NFP_REPR_TYPE_PF) {
			port->pf_id = i;
			port->vnic = priv->nn->dp.ctrl_bar;
		} else {
			port->pf_id = 0;
			port->vf_id = i;
			port->vnic =
				app->pf->vf_cfg_mem + i * NFP_NET_CFG_BAR_SZ;
		}

		eth_hw_addr_random(repr);

		port_id = nfp_flower_cmsg_pcie_port(nfp_pcie, vnic_type,
						    i, queue);
		err = nfp_repr_init(app, repr,
				    port_id, port, priv->nn->dp.netdev);
		if (err) {
			nfp_port_free(port);
			nfp_repr_free(repr);
			goto err_reprs_clean;
		}

		RCU_INIT_POINTER(reprs->reprs[i], repr);
		nfp_info(app->cpp, "%s%d Representor(%s) created\n",
			 repr_type == NFP_REPR_TYPE_PF ? "PF" : "VF", i,
			 repr->name);
	}

	nfp_app_reprs_set(app, repr_type, reprs);

	atomic_set(replies, 0);
	reify_cnt = nfp_flower_reprs_reify(app, repr_type, true);
	if (reify_cnt < 0) {
		err = reify_cnt;
		nfp_warn(app->cpp, "Failed to notify firmware about repr creation\n");
		goto err_reprs_remove;
	}

	err = nfp_flower_wait_repr_reify(app, replies, reify_cnt);
	if (err)
		goto err_reprs_remove;

	return 0;
err_reprs_remove:
	reprs = nfp_app_reprs_set(app, repr_type, NULL);
err_reprs_clean:
	nfp_reprs_clean_and_free(app, reprs);
	return err;
}