linux-kernel - [PATCH] net/mlx5: handle errors in mlx5_chains_create

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Message-ID: <20250304080323.2237-1-vulab@iscas.ac.cn>
Date: Tue,  4 Mar 2025 16:03:23 +0800
From: Wentao Liang <vulab@...as.ac.cn>
To: saeedm@...dia.com,
	leon@...nel.org,
	tariqt@...dia.com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Wentao Liang <vulab@...as.ac.cn>
Subject: [PATCH] net/mlx5: handle errors in mlx5_chains_create_table()

Add error handling for mlx5_get_fdb_sub_ns() and
mlx5_get_flow_namespace() failures in mlx5_chains_create_table().
Log error message with  mlx5_core_warn() to prevent silent failures
and return immediately to prevent null pointer dereference of ns.

Signed-off-by: Wentao Liang <vulab@...as.ac.cn>
---
 drivers/net/ethernet/mellanox/mlx5/core/lib/fs_chains.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_chains.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_chains.c
index a80ecb672f33..e808531cc6f5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_chains.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_chains.c
@@ -196,6 +196,11 @@ mlx5_chains_create_table(struct mlx5_fs_chains *chains,
 		ns = mlx5_get_flow_namespace(chains->dev, chains->ns);
 	}
 
+	if (!ns) {
+		mlx5_core_warn(chains->dev, "Failed to get flow namespace\n");
+		return NULL;
+	}
+
 	ft_attr.autogroup.num_reserved_entries = 2;
 	ft_attr.autogroup.max_num_groups = chains->group_num;
 	ft = mlx5_create_auto_grouped_flow_table(ns, &ft_attr);
-- 
2.42.0.windows.2