app/testpmd: fix packet burst spreading stats

RX/TX functions (rte_eth_rx_burst/rte_eth_tx_burst) get 'nb_pkts'
argument, which specifies the maximum number to receive/transmit.
It can be 0..nb_pkts, meaning nb_pkts+1 options.
Testpmd can provide statistics of the burst sizes ('set
record-burst-stats on') by incrementing an array cell of index
<burst-size>. This array is mistakenly [MAX_PKT_BURST] size. Receiving
the maximum burst will cause out of bound write.
Enlarge the spread stats array by one cell to fix it.

Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org
Signed-off-by: Eli Britstein <elibr@nvidia.com>
Reviewed-by: Matan Azrad <matan@nvidia.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 6d5bbc8..2b835a2 100644 (file)
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -1879,7 +1879,7 @@ pkt_burst_stats_display(const char *rx_tx, struct pkt_burst_stats *pbs)
        pktnb_stats[0] = 0;
 
        /* Find the next 2 burst sizes with highest occurrences. */
-       for (nb_pkt = 1; nb_pkt < MAX_PKT_BURST; nb_pkt++) {
+       for (nb_pkt = 1; nb_pkt < MAX_PKT_BURST + 1; nb_pkt++) {
                nb_burst = pbs->pkt_burst_spread[nb_pkt];
 
                if (nb_burst == 0)

diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index bf36691..071e4e7 100644 (file)
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -96,7 +96,7 @@ enum {
  * that are recorded for each forwarding stream.
  */
 struct pkt_burst_stats {
-       unsigned int pkt_burst_spread[MAX_PKT_BURST];
+       unsigned int pkt_burst_spread[MAX_PKT_BURST + 1];
 };
 
 /** Information for a given RSS type. */