Re: [PATCH v4 1/1] net/mlx5: Fix null-ptr-deref in mlx5_create_{inner_,}ttc_table()

[Tariq Toukan <ttoukan.linux@gmail.com>]

On 11/04/2025 16:14, 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@gmail.com>
> ---
> V3 -> V4: Fix potential memory leak.
> V2 -> V3: No functional changes, just gathering the patches in a series.
> V1 -> V2: Add a empty line after the return statement.
> 
>   drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c | 12 ++++++++++++
>   1 file changed, 12 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..077fe908bf86 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c
> @@ -651,10 +651,16 @@ struct mlx5_ttc_table *mlx5_create_inner_ttc_table(struct mlx5_core_dev *dev,
>   			MLX5_CAP_NIC_RX_FT_FIELD_SUPPORT_2(dev, inner_l4_type);
>   		break;
>   	default:
> +		kvfree(ttc);

Unrelated change.
Not described in patch subject or commit message.
Please introduce in a separate patch.

>   		return ERR_PTR(-EINVAL);
>   	}
>   
>   	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];
>   
> @@ -724,10 +730,16 @@ struct mlx5_ttc_table *mlx5_create_ttc_table(struct mlx5_core_dev *dev,
>   			MLX5_CAP_NIC_RX_FT_FIELD_SUPPORT_2(dev, outer_l4_type);
>   		break;
>   	default:
> +		kvfree(ttc);

Same.

>   		return ERR_PTR(-EINVAL);
>   	}
>   
>   	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];
>