linux-kernel - [PATCH net-next] net/mlx5: fix uninit value use

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Date:   Wed, 25 Oct 2023 16:50:50 +0200
From:   Przemek Kitszel <przemyslaw.kitszel@...el.com>
To:     netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Jiri Pirko <jiri@...nulli.us>
Cc:     linux-kernel@...r.kernel.org, Leon Romanovsky <leon@...nel.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Danielle Ratson <danieller@...dia.com>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>,
        Eran Ben Elisha <eranbe@...dia.com>,
        Aya Levin <ayal@...lanox.com>, Simon Horman <horms@...nel.org>,
        Przemek Kitszel <przemyslaw.kitszel@...el.com>,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH net-next] net/mlx5: fix uninit value use

Avoid use of uninitialized state variable.

In case of mlx5e_tx_reporter_build_diagnose_output_sq_common() it's better
to still collect other data than bail out entirely.

Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Link: https://lore.kernel.org/netdev/8bd30131-c9f2-4075-a575-7fa2793a1760@moroto.mountain
Fixes: d17f98bf7cc9 ("net/mlx5: devlink health: use retained error fmsg API")
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c | 6 +++++-
 drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c | 8 ++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
index fc5a9fdd06db..fea8c0a5fe89 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
@@ -263,8 +263,12 @@ mlx5e_rx_reporter_build_diagnose_output_rq_common(struct mlx5e_rq *rq,
 	if (rq->icosq) {
 		struct mlx5e_icosq *icosq = rq->icosq;
 		u8 icosq_hw_state;
+		int err;
+
+		err = mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
+		if (err)
+			return err;
 
-		mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
 		mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
 	}
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
index ccff7c26d6ac..6b44ddce14e9 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
@@ -221,12 +221,16 @@ mlx5e_tx_reporter_build_diagnose_output_sq_common(struct devlink_fmsg *fmsg,
 	bool stopped = netif_xmit_stopped(sq->txq);
 	struct mlx5e_priv *priv = sq->priv;
 	u8 state;
+	int err;
 
-	mlx5_core_query_sq_state(priv->mdev, sq->sqn, &state);
 	devlink_fmsg_u32_pair_put(fmsg, "tc", tc);
 	devlink_fmsg_u32_pair_put(fmsg, "txq ix", sq->txq_ix);
 	devlink_fmsg_u32_pair_put(fmsg, "sqn", sq->sqn);
-	devlink_fmsg_u8_pair_put(fmsg, "HW state", state);
+
+	err = mlx5_core_query_sq_state(priv->mdev, sq->sqn, &state);
+	if (!err)
+		devlink_fmsg_u8_pair_put(fmsg, "HW state", state);
+
 	devlink_fmsg_bool_pair_put(fmsg, "stopped", stopped);
 	devlink_fmsg_u32_pair_put(fmsg, "cc", sq->cc);
 	devlink_fmsg_u32_pair_put(fmsg, "pc", sq->pc);
-- 
2.38.1