[PATCH] net/tap: fix close for partially configured port

[David Marchand <david.marchand@redhat.com>]

In case no rxq has been set up (like when starting testpmd with no mempool
drivers), a crash happens in tap_dev_close:

Thread 1 "dpdk-testpmd" received signal SIGSEGV, Segmentation fault.
0x00007ffff7fad68b in tap_dev_close (dev=dev@entry=0x4c4a80
	<rte_eth_devices@INTERNAL>) at ../drivers/net/tap/rte_eth_tap.c:1111
1111			struct rx_queue *rxq = dev->data->rx_queues[i];

(gdb) p dev->data->rx_queues
$4 = (void **) 0x0

Fixes: 23e2387b49a1 ("net/tap: allocate queue structures dynamically")

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 drivers/net/tap/rte_eth_tap.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 64b359914b..6d710131e8 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -1108,17 +1108,22 @@ tap_dev_close(struct rte_eth_dev *dev)
 #endif
 
 	for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
-		struct rx_queue *rxq = dev->data->rx_queues[i];
+		struct rx_queue *rxq = NULL;
+		struct rx_queue *txq = NULL;
 
 		tap_queue_close(process_private, i);
 
+		if (dev->data->rx_queues != NULL)
+			rxq = dev->data->rx_queues[i];
 		if (rxq != NULL) {
 			tap_rxq_pool_free(rxq->pool);
 			rte_free(rxq);
 			dev->data->rx_queues[i] = NULL;
 		}
 
-		if (dev->data->tx_queues[i] != NULL) {
+		if (dev->data->tx_queues != NULL)
+			txq = dev->data->tx_queues[i];
+		if (txq != NULL) {
 			rte_free(dev->data->tx_queues[i]);
 			dev->data->tx_queues[i] = NULL;
 		}
-- 
2.53.0