Re: [Intel-wired-lan] [PATCH net v2] ice: fix memory leak in ice_lbtest_prepare_rings()

[Marcin Szycik <marcin.szycik@linux.intel.com>]

On 11.06.2026 18:12, Dawei Feng wrote:
> ice_lbtest_prepare_rings() frees Rx rings only when
> ice_vsi_start_all_rx_rings() fails. If ice_vsi_setup_rx_rings() fails
> after allocating some descriptors, or if ice_vsi_cfg_lan() fails after
> the Rx rings were prepared, the function reaches the Tx cleanup path
> without releasing the initialized Rx resources.
> 
> Fix this by adding separate unwind paths for Rx setup failure and LAN
> configuration failure. The Rx setup failure path releases the partially
> prepared Rx rings before freeing Tx rings, while later failures first
> undo the LAN Tx configuration and then release the Rx rings in reverse
> setup order.
> 
> The bug was first flagged by an experimental analysis tool we are
> developing for kernel memory-management bugs while analyzing
> v6.13-rc1. The tool is still under development and is not yet publicly
> available. Manual inspection confirms that the bug is still
> present in v7.1-rc5.
> 
> An x86_64 allyesconfig build showed no new warnings. As we do not have an
> Intel E800 Series adapter available to run the ethtool offline loopback
> selftest, no runtime testing was able to be performed.
> 
> Fixes: 0e674aeb0b77 ("ice: Add handler for ethtool selftest")
> Cc: stable@vger.kernel.org
> Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
> Signed-off-by: Dawei Feng <dawei.feng@seu.edu.cn>

LGTM
Reviewed-by: Marcin Szycik <marcin.szycik@linux.intel.com>

> ---
> Changes in v2:
> - Fix cleanup order
> 
>  drivers/net/ethernet/intel/ice/ice_ethtool.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
> index f28416a707d7..10a4abc66974 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
> @@ -1069,18 +1069,18 @@ static int ice_lbtest_prepare_rings(struct ice_vsi *vsi)
>  
>  	status = ice_vsi_cfg_lan(vsi);
>  	if (status)
> -		goto err_setup_rx_ring;
> +		goto err_cfg_lan;
>  
>  	status = ice_vsi_start_all_rx_rings(vsi);
>  	if (status)
> -		goto err_start_rx_ring;
> +		goto err_cfg_lan;
>  
>  	return 0;
>  
> -err_start_rx_ring:
> -	ice_vsi_free_rx_rings(vsi);
> -err_setup_rx_ring:
> +err_cfg_lan:
>  	ice_vsi_stop_lan_tx_rings(vsi, ICE_NO_RESET, 0);
> +err_setup_rx_ring:
> +	ice_vsi_free_rx_rings(vsi);
>  err_setup_tx_ring:
>  	ice_vsi_free_tx_rings(vsi);
>