ethdev: fix crash on owner delete

[ upstream commit b7ade5d ]

'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: 33c73aa ("ethdev: allow ownership operations on unused port")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Chenbo Xia <chenbo.xia@intel.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

lib/librte_ethdev/rte_ethdev.c

@@ -702,10 +702,13 @@ rte_eth_dev_owner_delete(const uint64_t owner_id)
 	rte_spinlock_lock(&rte_eth_dev_shared_data->ownership_lock);
 
 	if (rte_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);