net/bnxt: fix getting statistics

[ upstream commit 75306ee ]

Avoid overrun in rte_eth_stats struct when the number of tx/rx
rings in use is greater than RTE_ETHDEV_QUEUE_STAT_CNTRS.

Fixes: 57d5e5b ("net/bnxt: add statistics")

Signed-off-by: Lance Richardson <lance.richardson@broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>

drivers/net/bnxt/bnxt_stats.c

@@ -350,14 +350,18 @@ int bnxt_stats_get_op(struct rte_eth_dev *eth_dev,
 	int rc = 0;
 	unsigned int i;
 	struct bnxt *bp = eth_dev->data->dev_private;
+	unsigned int num_q_stats;
 
 	memset(bnxt_stats, 0, sizeof(*bnxt_stats));
 	if (!(bp->flags & BNXT_FLAG_INIT_DONE)) {
 		PMD_DRV_LOG(ERR, "Device Initialization not complete!\n");
 		return -1;
 	}
 
-	for (i = 0; i < bp->rx_cp_nr_rings; i++) {
+	num_q_stats = RTE_MIN(bp->rx_cp_nr_rings,
+			      (unsigned int)RTE_ETHDEV_QUEUE_STAT_CNTRS);
+
+	for (i = 0; i < num_q_stats; i++) {
 		struct bnxt_rx_queue *rxq = bp->rx_queues[i];
 		struct bnxt_cp_ring_info *cpr = rxq->cp_ring;
 
@@ -369,7 +373,10 @@ int bnxt_stats_get_op(struct rte_eth_dev *eth_dev,
 				rte_atomic64_read(&rxq->rx_mbuf_alloc_fail);
 	}
 
-	for (i = 0; i < bp->tx_cp_nr_rings; i++) {
+	num_q_stats = RTE_MIN(bp->tx_cp_nr_rings,
+			      (unsigned int)RTE_ETHDEV_QUEUE_STAT_CNTRS);
+
+	for (i = 0; i < num_q_stats; i++) {
 		struct bnxt_tx_queue *txq = bp->tx_queues[i];
 		struct bnxt_cp_ring_info *cpr = txq->cp_ring;