[dpdk-dev] [PATCH v2] net/virtio: fix add pointer checking for rxvq

[zhiyong.yang@intel.com]

For virtio-user server mode, one use case comes across segmentation fault.
step 1: Launch vhost side as client firstly.
step 2: launch virtio-user side as server.

The cause is: after registering virtio_interrupt_handler into
eal-intr-thread, two threads (main thread and eal-intr-thread) have
sync issues, so add rxvq pointer checking in function virtio_notify_peers
to decide if the code can continue.

Fixes: bd8f50a45d0f ("net/virtio-user: support server mode")
Cc: stable@dpdk.org
Cc: maxime.coquelin@redhat.com
Cc: tiwei.bie@intel.com
Cc: lei.a.yao@intel.com
Cc: ferruh.yigit@intel.com

Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

Change in V2:
change title prefix from net/virtio-user to net/virtio.

 drivers/net/virtio/virtio_ethdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 5833dad73..df50a571a 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1245,6 +1245,9 @@ virtio_notify_peers(struct rte_eth_dev *dev)
 		return;
 
 	rxvq = dev->data->rx_queues[0];
+	if (!rxvq)
+		return;
+
 	rarp_mbuf = rte_net_make_rarp_packet(rxvq->mpool,
 			(struct ether_addr *)hw->mac_addr);
 	if (rarp_mbuf == NULL) {
-- 
2.14.3