[dpdk-stable] [PATCH v2 1/5] net/virtio: fix add pointer checking

[zhiyong.yang at intel.com]

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 done.

Fixes: 7365504f77e3("net/virtio: support guest announce")
Cc: stable at dpdk.org
Signed-off-by: Zhiyong Yang <zhiyong.yang at intel.com>
---
 drivers/net/virtio/virtio_ethdev.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 884f74ad0..b38582c8d 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1273,9 +1273,14 @@ 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) {
-- 
2.14.3