Re: [PATCH] net/mlx5: Free steering tag data on release

[Tariq Toukan <tariqt@nvidia.com>]

On 13/06/2026 18:37, lirongqing wrote:
> From: Li RongQing <lirongqing@baidu.com>
> 
> mlx5_st_alloc_index() allocates an mlx5_st_idx_data object for
> each new steering tag table index and stores it in the xarray.
> When the last user releases the index, mlx5_st_dealloc_index()
> removes the entry from the xarray but did not free the backing
> object, leaking memory.
> 
> Free idx_data after erasing the xarray entry once the refcount
> reaches zero.
> 
> Fixes: 888a7776f4fb0 ("net/mlx5: Add support for device steering tag")
> Signed-off-by: Li RongQing <lirongqing@baidu.com>
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/lib/st.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c
> index 997be91..7cedc34 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c
> @@ -175,6 +175,7 @@ int mlx5_st_dealloc_index(struct mlx5_core_dev *dev, u16 st_index)
>   
>   	if (refcount_dec_and_test(&idx_data->usecount)) {
>   		xa_erase(&st->idx_xa, st_index);
> +		kfree(idx_data);
>   		/* We leave PCI config space as was before, no mkey will refer to it */
>   	}
>   

Reviewed-by: Tariq Toukan <tariqt@nvidia.com>