net/virtio: fix queues pointer check

It is necessary to add pointer checking because in some case the
code will cause crash. For example, the code goes here before
memory allocation of rxvq is finished.

Fixes: 7365504f77e3 ("net/virtio: support guest announce")
Cc: stable@dpdk.org
Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
Reviewed-by: Jianfeng Tan <jianfeng.tan@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 4dddb1c..4a1971c 100644 (file)
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1232,9 +1232,13 @@ static void
 virtio_notify_peers(struct rte_eth_dev *dev)
 {
        struct virtio_hw *hw = dev->data->dev_private;
-       struct virtnet_rx *rxvq = dev->data->rx_queues[0];
+       struct virtnet_rx *rxvq;
        struct rte_mbuf *rarp_mbuf;
 
+       if (!dev->data->rx_queues)
+               return;
+
+       rxvq = dev->data->rx_queues[0];
        rarp_mbuf = rte_net_make_rarp_packet(rxvq->mpool,
                        (struct ether_addr *)hw->mac_addr);
        if (rarp_mbuf == NULL) {