[PATCH v8 4/5] net/null: add check for pool vs packet size

[Stephen Hemminger <stephen@networkplumber.org>]

The mbuf pool passed when setting up queue must have space
in the mbuf to hold the requested packet size; otherwise the
code in eth_null_copy_rx() would generate invalid mbuf.

Fixes: c743e50c475f ("null: new poll mode driver")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/null/rte_eth_null.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/null/rte_eth_null.c b/drivers/net/null/rte_eth_null.c
index 4496c093a7..4b4d996686 100644
--- a/drivers/net/null/rte_eth_null.c
+++ b/drivers/net/null/rte_eth_null.c
@@ -241,6 +241,9 @@ eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 
 	packet_size = internals->packet_size;
 
+	if (rte_pktmbuf_data_room_size(mb_pool) < packet_size)
+		return -ENOSPC;
+
 	internals->rx_null_queues[rx_queue_id].mb_pool = mb_pool;
 	dev->data->rx_queues[rx_queue_id] =
 		&internals->rx_null_queues[rx_queue_id];
-- 
2.51.0