Re: [PATCH 3/7] net/ncsi: Use struct sockaddr_storage for pending_mac

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

On 20/05/25 16:31, Kees Cook wrote:
> To avoid future casting with coming API type changes, switch struct
> ncsi_dev_priv::pending_mac to a full struct sockaddr_storage.
> 
> Signed-off-by: Kees Cook <kees@kernel.org>

Acked-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks!
-Gustavo

> ---
> Cc: Samuel Mendoza-Jonas <sam@mendozajonas.com>
> Cc: Paul Fertser <fercerpav@gmail.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: Simon Horman <horms@kernel.org>
> Cc: <netdev@vger.kernel.org>
> ---
>   net/ncsi/internal.h    |  2 +-
>   net/ncsi/ncsi-manage.c |  2 +-
>   net/ncsi/ncsi-rsp.c    | 18 +++++++++---------
>   3 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
> index 2c260f33b55c..e76c6de0c784 100644
> --- a/net/ncsi/internal.h
> +++ b/net/ncsi/internal.h
> @@ -322,7 +322,7 @@ struct ncsi_dev_priv {
>   #define NCSI_DEV_RESHUFFLE	4
>   #define NCSI_DEV_RESET		8            /* Reset state of NC          */
>   	unsigned int        gma_flag;        /* OEM GMA flag               */
> -	struct sockaddr     pending_mac;     /* MAC address received from GMA */
> +	struct sockaddr_storage pending_mac; /* MAC address received from GMA */
>   	spinlock_t          lock;            /* Protect the NCSI device    */
>   	unsigned int        package_probe_id;/* Current ID during probe    */
>   	unsigned int        package_num;     /* Number of packages         */
> diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
> index b36947063783..0202db2aea3e 100644
> --- a/net/ncsi/ncsi-manage.c
> +++ b/net/ncsi/ncsi-manage.c
> @@ -1058,7 +1058,7 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
>   		break;
>   	case ncsi_dev_state_config_apply_mac:
>   		rtnl_lock();
> -		ret = dev_set_mac_address(dev, &ndp->pending_mac, NULL);
> +		ret = dev_set_mac_address(dev, (struct sockaddr *)&ndp->pending_mac, NULL);
>   		rtnl_unlock();
>   		if (ret < 0)
>   			netdev_warn(dev, "NCSI: 'Writing MAC address to device failed\n");
> diff --git a/net/ncsi/ncsi-rsp.c b/net/ncsi/ncsi-rsp.c
> index 8668888c5a2f..472cc68ad86f 100644
> --- a/net/ncsi/ncsi-rsp.c
> +++ b/net/ncsi/ncsi-rsp.c
> @@ -628,7 +628,7 @@ static int ncsi_rsp_handler_snfc(struct ncsi_request *nr)
>   static int ncsi_rsp_handler_oem_gma(struct ncsi_request *nr, int mfr_id)
>   {
>   	struct ncsi_dev_priv *ndp = nr->ndp;
> -	struct sockaddr *saddr = &ndp->pending_mac;
> +	struct sockaddr_storage *saddr = &ndp->pending_mac;
>   	struct net_device *ndev = ndp->ndev.dev;
>   	struct ncsi_rsp_oem_pkt *rsp;
>   	u32 mac_addr_off = 0;
> @@ -644,11 +644,11 @@ static int ncsi_rsp_handler_oem_gma(struct ncsi_request *nr, int mfr_id)
>   	else if (mfr_id == NCSI_OEM_MFR_INTEL_ID)
>   		mac_addr_off = INTEL_MAC_ADDR_OFFSET;
>   
> -	saddr->sa_family = ndev->type;
> -	memcpy(saddr->sa_data, &rsp->data[mac_addr_off], ETH_ALEN);
> +	saddr->ss_family = ndev->type;
> +	memcpy(saddr->__data, &rsp->data[mac_addr_off], ETH_ALEN);
>   	if (mfr_id == NCSI_OEM_MFR_BCM_ID || mfr_id == NCSI_OEM_MFR_INTEL_ID)
> -		eth_addr_inc((u8 *)saddr->sa_data);
> -	if (!is_valid_ether_addr((const u8 *)saddr->sa_data))
> +		eth_addr_inc(saddr->__data);
> +	if (!is_valid_ether_addr(saddr->__data))
>   		return -ENXIO;
>   
>   	/* Set the flag for GMA command which should only be called once */
> @@ -1088,7 +1088,7 @@ static int ncsi_rsp_handler_netlink(struct ncsi_request *nr)
>   static int ncsi_rsp_handler_gmcma(struct ncsi_request *nr)
>   {
>   	struct ncsi_dev_priv *ndp = nr->ndp;
> -	struct sockaddr *saddr = &ndp->pending_mac;
> +	struct sockaddr_storage *saddr = &ndp->pending_mac;
>   	struct net_device *ndev = ndp->ndev.dev;
>   	struct ncsi_rsp_gmcma_pkt *rsp;
>   	int i;
> @@ -1105,15 +1105,15 @@ static int ncsi_rsp_handler_gmcma(struct ncsi_request *nr)
>   			    rsp->addresses[i][4], rsp->addresses[i][5]);
>   	}
>   
> -	saddr->sa_family = ndev->type;
> +	saddr->ss_family = ndev->type;
>   	for (i = 0; i < rsp->address_count; i++) {
>   		if (!is_valid_ether_addr(rsp->addresses[i])) {
>   			netdev_warn(ndev, "NCSI: Unable to assign %pM to device\n",
>   				    rsp->addresses[i]);
>   			continue;
>   		}
> -		memcpy(saddr->sa_data, rsp->addresses[i], ETH_ALEN);
> -		netdev_warn(ndev, "NCSI: Will set MAC address to %pM\n", saddr->sa_data);
> +		memcpy(saddr->__data, rsp->addresses[i], ETH_ALEN);
> +		netdev_warn(ndev, "NCSI: Will set MAC address to %pM\n", saddr->__data);
>   		break;
>   	}
>