null: fix build with gcc 5.1

On Fedora 22, with GCC 5.1, errors are reported due to array accesses
being potentially out of bounds. This commit fixes this by adding in an
extra bounds check to the loop counters, or, in the case of stats reset,
by blindly zeroing the whole array, rather than just the part that is in
use.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>

diff --git a/drivers/net/null/rte_eth_null.c b/drivers/net/null/rte_eth_null.c
index 5895065..7792315 100644 (file)
--- a/drivers/net/null/rte_eth_null.c
+++ b/drivers/net/null/rte_eth_null.c
@@ -298,7 +298,8 @@ eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
        internal = dev->data->dev_private;
        memset(igb_stats, 0, sizeof(*igb_stats));
        num_stats = RTE_MIN((unsigned)RTE_ETHDEV_QUEUE_STAT_CNTRS,
-                                       internal->nb_rx_queues);
+                       RTE_MIN(internal->nb_rx_queues,
+                               RTE_DIM(internal->rx_null_queues)));
        for (i = 0; i < num_stats; i++) {
                igb_stats->q_ipackets[i] =
                        internal->rx_null_queues[i].rx_pkts.cnt;
@@ -306,7 +307,8 @@ eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
        }
 
        num_stats = RTE_MIN((unsigned)RTE_ETHDEV_QUEUE_STAT_CNTRS,
-                                       internal->nb_tx_queues);
+                       RTE_MIN(internal->nb_tx_queues,
+                               RTE_DIM(internal->tx_null_queues)));
        for (i = 0; i < num_stats; i++) {
                igb_stats->q_opackets[i] =
                        internal->tx_null_queues[i].tx_pkts.cnt;
@@ -331,9 +333,9 @@ eth_stats_reset(struct rte_eth_dev *dev)
                return;
 
        internal = dev->data->dev_private;
-       for (i = 0; i < internal->nb_rx_queues; i++)
+       for (i = 0; i < RTE_DIM(internal->rx_null_queues); i++)
                internal->rx_null_queues[i].rx_pkts.cnt = 0;
-       for (i = 0; i < internal->nb_tx_queues; i++) {
+       for (i = 0; i < RTE_DIM(internal->tx_null_queues); i++) {
                internal->tx_null_queues[i].tx_pkts.cnt = 0;
                internal->tx_null_queues[i].err_pkts.cnt = 0;
        }