linux-kernel - [PATCH][linux-next] net/mlx5: Bridge, fix uninitialized variable in mlx5_esw_bridge_port

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Message-Id: <20210818155210.14522-1-tim.gardner@canonical.com>
Date:   Wed, 18 Aug 2021 09:52:10 -0600
From:   Tim Gardner <tim.gardner@...onical.com>
To:     linux-kernel@...r.kernel.org
Cc:     tim.gardner@...onical.com, Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Vlad Buslov <vladbu@...dia.com>,
        Jianbo Liu <jianbol@...dia.com>,
        Mark Bloch <mbloch@...dia.com>, Roi Dayan <roid@...dia.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: [PATCH][linux-next] net/mlx5: Bridge, fix uninitialized variable in mlx5_esw_bridge_port_changeupper()

A recent change removed code that initialized the return code variable 'err'. It
is now possible for mlx5_esw_bridge_port_changeupper() to return an error code
using this uninitialized variable. Fix it by initializing to 0.

Addresses-Coverity: ("Uninitialized scalar variable (UNINIT)")

Cc: Saeed Mahameed <saeedm@...dia.com>
Cc: Leon Romanovsky <leon@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Vlad Buslov <vladbu@...dia.com>
Cc: Jianbo Liu <jianbol@...dia.com>
Cc: Mark Bloch <mbloch@...dia.com>
Cc: Roi Dayan <roid@...dia.com>
Cc: Vladimir Oltean <vladimir.oltean@....com>
Cc: netdev@...r.kernel.org
Cc: linux-rdma@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c
index 0c38c2e319be..c6435c69b7c4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c
@@ -137,7 +137,7 @@ static int mlx5_esw_bridge_port_changeupper(struct notifier_block *nb, void *ptr
 	u16 vport_num, esw_owner_vhca_id;
 	struct netlink_ext_ack *extack;
 	int ifindex = upper->ifindex;
-	int err;
+	int err = 0;
 
 	if (!netif_is_bridge_master(upper))
 		return 0;
-- 
2.33.0