linux-kernel - Re: [PATCH net] net/mlx5: Fix error handling in mlx5_init_one

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Date: Fri, 10 May 2024 08:44:26 +0200
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
CC: Shay Drory <shayd@...dia.com>, Saeed Mahameed <saeedm@...dia.com>, "Leon
 Romanovsky" <leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Moshe Shemesh
	<moshe@...dia.com>, <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH net] net/mlx5: Fix error handling in mlx5_init_one_light()

On Thu, May 09, 2024 at 02:00:18PM +0300, Dan Carpenter wrote:
> If mlx5_query_hca_caps_light() fails then calling devl_unregister() or
> devl_unlock() is a bug.  It's not registered and it's not locked.  That
> will trigger a stack trace in this case because devl_unregister() checks
> both those things at the start of the function.
> 
> If mlx5_devlink_params_register() fails then this code will call
> devl_unregister() and devl_unlock() twice which will again lead to a
> stack trace or possibly something worse as well.
> 
> Fixes: bf729988303a ("net/mlx5: Restore mistakenly dropped parts in register devlink flow")
> Fixes: c6e77aa9dd82 ("net/mlx5: Register devlink first under devlink lock")

Reviewed-by: Larysa Zaremba <larysa.zaremba@...el.com>

> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/main.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> index 331ce47f51a1..105c98160327 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> @@ -1690,7 +1690,7 @@ int mlx5_init_one_light(struct mlx5_core_dev *dev)
>  	err = mlx5_query_hca_caps_light(dev);
>  	if (err) {
>  		mlx5_core_warn(dev, "mlx5_query_hca_caps_light err=%d\n", err);
> -		goto query_hca_caps_err;
> +		goto err_function_disable;
>  	}
>  
>  	devl_lock(devlink);
> @@ -1699,18 +1699,16 @@ int mlx5_init_one_light(struct mlx5_core_dev *dev)
>  	err = mlx5_devlink_params_register(priv_to_devlink(dev));
>  	if (err) {
>  		mlx5_core_warn(dev, "mlx5_devlink_param_reg err = %d\n", err);
> -		goto params_reg_err;
> +		goto err_unregister;
>  	}
>  
>  	devl_unlock(devlink);
>  	return 0;
>  
> -params_reg_err:
> -	devl_unregister(devlink);
> -	devl_unlock(devlink);
> -query_hca_caps_err:
> +err_unregister:
>  	devl_unregister(devlink);
>  	devl_unlock(devlink);
> +err_function_disable:
>  	mlx5_function_disable(dev, true);
>  out:
>  	dev->state = MLX5_DEVICE_STATE_INTERNAL_ERROR;
> -- 
> 2.43.0
> 
>