linux-kernel - [PATCH V2] net/mlx5e: fix potential null dereference in mlx5e_tc_nic_create_miss

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Message-ID: <20250407072032.5232-1-hanchunchao@inspur.com>
Date: Mon, 7 Apr 2025 15:20:31 +0800
From: Charles Han <hanchunchao@...pur.com>
To: <saeedm@...dia.com>, <tariqt@...dia.com>, <leon@...nel.org>,
	<andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <lariel@...dia.com>,
	<paulb@...dia.com>, <maord@...dia.com>
CC: <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Charles Han <hanchunchao@...pur.com>
Subject: [PATCH V2] net/mlx5e: fix potential null dereference in mlx5e_tc_nic_create_miss_table

mlx5_get_flow_namespace() may return a NULL pointer, dereferencing it
without NULL check may lead to NULL dereference.
Add a NULL check for ns.

Fixes: 66cb64e292d2 ("net/mlx5e: TC NIC mode, fix tc chains miss table")
Signed-off-by: Charles Han <hanchunchao@...pur.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 9ba99609999f..c2f23ac95c3d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -5216,6 +5216,10 @@ static int mlx5e_tc_nic_create_miss_table(struct mlx5e_priv *priv)
 	ft_attr.level = MLX5E_TC_MISS_LEVEL;
 	ft_attr.prio = 0;
 	ns = mlx5_get_flow_namespace(priv->mdev, MLX5_FLOW_NAMESPACE_KERNEL);
+	if (!ns) {
+		netdev_err(priv->mdev, "Failed to get flow namespace\n");
+		return -EOPNOTSUPP;
+	}
 
 	*ft = mlx5_create_auto_grouped_flow_table(ns, &ft_attr);
 	if (IS_ERR(*ft)) {
-- 
2.43.0