netdev - Re: [PATCH v5 1/2] net/mlx5: Fix null-ptr-deref in mlx5_create_{inner_,}ttc

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Message-ID: <e0db67c9-8e38-490a-98a2-13c61ef11aa5@nvidia.com>
Date: Tue, 15 Apr 2025 16:45:28 +0300
From: Mark Bloch <mbloch@...dia.com>
To: Henry Martin <bsdhenrymartin@...il.com>, 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, amirtz@...dia.com, ayal@...dia.com
Subject: Re: [PATCH v5 1/2] net/mlx5: Fix null-ptr-deref in
 mlx5_create_{inner_,}ttc_table()



On 15/04/2025 15:41, Henry Martin wrote:
> Add NULL check for mlx5_get_flow_namespace() returns in
> mlx5_create_inner_ttc_table() and mlx5_create_ttc_table() to prevent
> NULL pointer dereference.
> 
> Fixes: 137f3d50ad2a ("net/mlx5: Support matching on l4_type for ttc_table")
> Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c
> index eb3bd9c7f66e..e48afd620d7e 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c
> @@ -655,6 +655,11 @@ struct mlx5_ttc_table *mlx5_create_inner_ttc_table(struct mlx5_core_dev *dev,
>  	}
>  
>  	ns = mlx5_get_flow_namespace(dev, params->ns_type);
> +	if (!ns) {
> +		kvfree(ttc);
> +		return ERR_PTR(-EOPNOTSUPP);
> +	}
> +
>  	groups = use_l4_type ? &inner_ttc_groups[TTC_GROUPS_USE_L4_TYPE] :
>  			       &inner_ttc_groups[TTC_GROUPS_DEFAULT];
>  
> @@ -728,6 +733,11 @@ struct mlx5_ttc_table *mlx5_create_ttc_table(struct mlx5_core_dev *dev,
>  	}
>  
>  	ns = mlx5_get_flow_namespace(dev, params->ns_type);
> +	if (!ns) {
> +		kvfree(ttc);
> +		return ERR_PTR(-EOPNOTSUPP);
> +	}
> +
>  	groups = use_l4_type ? &ttc_groups[TTC_GROUPS_USE_L4_TYPE] :
>  			       &ttc_groups[TTC_GROUPS_DEFAULT];
>  

Reviewed-by: Mark Bloch <mbloch@...dia.com>

Mark