netdev - [RFC PATCH net-next 12/19] bridge: mcast: Add a centralized error path

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Message-Id: <20221018120420.561846-13-idosch@nvidia.com>
Date:   Tue, 18 Oct 2022 15:04:13 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, roopa@...dia.com, razor@...ckwall.org,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [RFC PATCH net-next 12/19] bridge: mcast: Add a centralized error path

Subsequent patches will add memory allocations in br_mdb_config_init()
as the MDB configuration structure will include a linked list of source
entries. This memory will need to be freed regardless if br_mdb_add()
succeeded or failed.

As a preparation for this change, add a centralized error path where the
memory will be freed.

Note that br_mdb_del() already has one error path and therefore does not
require any changes.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 net/bridge/br_mdb.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 26740df62fd6..157ba4e765c1 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -1053,28 +1053,29 @@ static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err)
 		return err;
 
+	err = -EINVAL;
 	/* host join errors which can happen before creating the group */
 	if (!cfg.p && !br_group_is_l2(&cfg.group)) {
 		/* don't allow any flags for host-joined IP groups */
 		if (cfg.entry->state) {
 			NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups");
-			return -EINVAL;
+			goto out;
 		}
 		if (!br_multicast_is_star_g(&cfg.group)) {
 			NL_SET_ERR_MSG_MOD(extack, "Groups with sources cannot be manually host joined");
-			return -EINVAL;
+			goto out;
 		}
 	}
 
 	if (br_group_is_l2(&cfg.group) && cfg.entry->state != MDB_PERMANENT) {
 		NL_SET_ERR_MSG_MOD(extack, "Only permanent L2 entries allowed");
-		return -EINVAL;
+		goto out;
 	}
 
 	if (cfg.p) {
 		if (cfg.p->state == BR_STATE_DISABLED && cfg.entry->state != MDB_PERMANENT) {
 			NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state and entry is not permanent");
-			return -EINVAL;
+			goto out;
 		}
 		vg = nbp_vlan_group(cfg.p);
 	} else {
@@ -1096,6 +1097,7 @@ static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 		err = __br_mdb_add(&cfg, extack);
 	}
 
+out:
 	return err;
 }
 
-- 
2.37.3