Subject: Re: [PATCH] ice: fix double free in ice_sf_eth_activate() error path

From: Breno Leitao <[email-masked]>
Date: Wed, 18 Mar 2026 10:39:27 -0700

On Wed, Mar 18, 2026 at 11:10:28PM +0800, Guangshuo Li wrote:
> When auxiliary_device_add() fails, ice_sf_eth_activate() jumps to
> aux_dev_uninit and calls auxiliary_device_uninit(&sf_dev->adev).
> 
> The device release callback ice_sf_dev_release() frees sf_dev, but
> the current error path falls through to sf_dev_free and calls
> kfree(sf_dev) again, causing a double free.
> 
> Keep kfree(sf_dev) for the auxiliary_device_init() failure path, but
> avoid falling through to sf_dev_free after auxiliary_device_uninit().
> 
> Fixes: 13acc5c4cdbe ("ice: subfunction activation and base devlink ops")
> Cc: [email-masked]
> Signed-off-by: Guangshuo Li <[email-masked]>
> ---
>  drivers/net/ethernet/intel/ice/ice_sf_eth.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_sf_eth.c b/drivers/net/ethernet/intel/ice/ice_sf_eth.c
> index 1a2c94375ca7..ec6020338b9f 100644
> --- a/drivers/net/ethernet/intel/ice/ice_sf_eth.c
> +++ b/drivers/net/ethernet/intel/ice/ice_sf_eth.c
> @@ -305,6 +305,7 @@ ice_sf_eth_activate(struct ice_dynamic_port *dyn_port,
>  
>  aux_dev_uninit:
>  	auxiliary_device_uninit(&sf_dev->adev);
> +	goto xa_erase;

Do you want to xa_erase?

Isn't ice_sf_dev_release() doing the xa_erase already on put_device()
path?