Re: [dpdk-stable] [PATCH] ethdev: fix crash on owner delete

["Xia, Chenbo" <chenbo.xia@intel.com>]

> -----Original Message-----
> From: stable <stable-bounces@dpdk.org> On Behalf Of Ferruh Yigit
> Sent: Thursday, November 4, 2021 7:04 PM
> To: Thomas Monjalon <thomas@monjalon.net>; Andrew Rybchenko
> <andrew.rybchenko@oktetlabs.ru>; Stephen Hemminger
> <stephen@networkplumber.org>; Matan Azrad <matan@mellanox.com>
> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; dev@dpdk.org; stable@dpdk.org;
> Matan Azrad <matan@nvidia.com>
> Subject: [dpdk-stable] [PATCH] ethdev: fix crash on owner delete
> 
> 'eth_dev->data' can be null before ethdev allocated. The API walks
> through all eth devices, at least for some data can be null.
> 
> Adding 'eth_dev->data' null check before accessing it.
> 
> Fixes: 33c73aae32e4 ("ethdev: allow ownership operations on unused port")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
> ---
> Cc: Matan Azrad <matan@nvidia.com>
> ---
>  lib/ethdev/rte_ethdev.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
> index 7db84b12d03b..8e679e4003db 100644
> --- a/lib/ethdev/rte_ethdev.c
> +++ b/lib/ethdev/rte_ethdev.c
> @@ -757,10 +757,13 @@ rte_eth_dev_owner_delete(const uint64_t owner_id)
>  	rte_spinlock_lock(&eth_dev_shared_data->ownership_lock);
> 
>  	if (eth_is_valid_owner_id(owner_id)) {
> -		for (port_id = 0; port_id < RTE_MAX_ETHPORTS; port_id++)
> -			if (rte_eth_devices[port_id].data->owner.id == owner_id)
> -				memset(&rte_eth_devices[port_id].data->owner, 0,
> +		for (port_id = 0; port_id < RTE_MAX_ETHPORTS; port_id++) {
> +			struct rte_eth_dev_data *data =
> +				rte_eth_devices[port_id].data;
> +			if (data != NULL && data->owner.id == owner_id)
> +				memset(&data->owner, 0,
>  				       sizeof(struct rte_eth_dev_owner));
> +		}
>  		RTE_ETHDEV_LOG(NOTICE,
>  			"All port owners owned by %016"PRIx64" identifier have
> removed\n",
>  			owner_id);
> --
> 2.31.1

Acked-by: Chenbo Xia <chenbo.xia@intel.com>