netdev - Re: [PATCH v4] net/mlx5: Add error handling in mlx5_query_nic_vport_node

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Message-ID: <aC/+51369a/LgCdU@mev-dev.igk.intel.com>
Date: Fri, 23 May 2025 06:51:51 +0200
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: Wentao Liang <vulab@...as.ac.cn>
Cc: 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, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v4] net/mlx5: Add error handling in
 mlx5_query_nic_vport_node_guid()

On Fri, May 23, 2025 at 10:43:04AM +0800, Wentao Liang wrote:
> The function mlx5_query_nic_vport_node_guid() calls the function
> mlx5_query_nic_vport_context() but does not check its return value.
> A proper implementation can be found in mlx5_nic_vport_query_local_lb().
> 
> Add error handling for mlx5_query_nic_vport_context(). If it fails, free
> the out buffer via kvfree() and return error code.
> 
> Fixes: 9efa75254593 ("net/mlx5_core: Introduce access functions to query vport RoCE fields")
> Cc: stable@...r.kernel.org # v4.5
> Target: net

You forgot to drop this tag (Simon replay to v3:
https://lore.kernel.org/netdev/20250522154057.GI365796@horms.kernel.org/#R)

> Signed-off-by: Wentao Liang <vulab@...as.ac.cn>
> ---
> v4: Fix code error.
> v3: Explicitly mention target branch. Change improper code.
> v2: Remove redundant reassignment. Fix typo error.
> 
>  drivers/net/ethernet/mellanox/mlx5/core/vport.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vport.c b/drivers/net/ethernet/mellanox/mlx5/core/vport.c
> index 0d5f750faa45..c34cd9a1a79b 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/vport.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/vport.c
> @@ -465,19 +465,22 @@ int mlx5_query_nic_vport_node_guid(struct mlx5_core_dev *mdev, u64 *node_guid)
>  {
>  	u32 *out;
>  	int outlen = MLX5_ST_SZ_BYTES(query_nic_vport_context_out);
> +	int err;
>  
>  	out = kvzalloc(outlen, GFP_KERNEL);
>  	if (!out)
>  		return -ENOMEM;
>  
> -	mlx5_query_nic_vport_context(mdev, 0, out);
> +	err = mlx5_query_nic_vport_context(mdev, 0, out);
> +	if (err)
> +		goto out;
>  
>  	*node_guid = MLX5_GET64(query_nic_vport_context_out, out,
>  				nic_vport_context.node_guid);
> -
> +out:
>  	kvfree(out);
>  
> -	return 0;
> +	return err;
>  }
>  EXPORT_SYMBOL_GPL(mlx5_query_nic_vport_node_guid);
>  
> -- 
> 2.42.0.windows.2