netdev - Re: [PATCH] net/mlx5: handle errors in mlx5_chains_create

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Message-ID: <49df4e60-695a-4562-aa27-f946e7acd485@gmail.com>
Date: Wed, 5 Mar 2025 21:12:22 +0200
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Wentao Liang <vulab@...as.ac.cn>, 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
Subject: Re: [PATCH] net/mlx5: handle errors in mlx5_chains_create_table()



On 04/03/2025 10:03, Wentao Liang wrote:
> 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

nit: double spaces before mlx5_core_warn.

> and return immediately to prevent null pointer dereference of ns.
> 
> Signed-off-by: Wentao Liang <vulab@...as.ac.cn>

Please add Fixes tag and target the patch to net.

> ---
>   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;

Callers expect error, not 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);