net/virtio-user: fix crash in server mode

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

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 5833dad..df50a57 100644 (file)
--- 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) {