linux-kernel - [PATCH][next] net/mlx5: Bridge: Fix uninitialized variable err

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Message-Id: <20210818142558.36722-1-colin.king@canonical.com>
Date:   Wed, 18 Aug 2021 15:25:58 +0100
From:   Colin King <colin.king@...onical.com>
To:     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>,
        Mark Bloch <mbloch@...dia.com>, Roi Dayan <roid@...dia.com>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] net/mlx5: Bridge: Fix uninitialized variable err

From: Colin Ian King <colin.king@...onical.com>

A recent change removed the assignment of err to the return from
the call mlx5_esw_bridge_lower_rep_vport_num_vhca_id_get, so now
err is uninitialized. This is problematic in the switch statement
where attr-id is SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS, there
is now a possibility of err not being assigned and the function
returning a garbage value in err. Fix this by initializing err
to zero.

Addresses-Coverity; ("Uninitialized scalar variable")
Fixes: ff9b7521468b ("net/mlx5: Bridge, support LAG")
Signed-off-by: Colin Ian King <colin.king@...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..4bf860f621f7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c
@@ -244,7 +244,7 @@ mlx5_esw_bridge_port_obj_attr_set(struct net_device *dev,
 	struct netlink_ext_ack *extack = switchdev_notifier_info_to_extack(&port_attr_info->info);
 	const struct switchdev_attr *attr = port_attr_info->attr;
 	u16 vport_num, esw_owner_vhca_id;
-	int err;
+	int err = 0;
 
 	if (!mlx5_esw_bridge_lower_rep_vport_num_vhca_id_get(dev, br_offloads->esw, &vport_num,
 							     &esw_owner_vhca_id))
-- 
2.32.0