[PATCH] net/iavf: add segment-length check to Tx prep

[Bruce Richardson <bruce.richardson@intel.com>]

In the Tx prep function, the metadata checks were only checking the
packet length and ignoring the data length. For single-buffer packets we
can quickly check that the data length is the packet length.

Fixes: 19ee91c6bd9a ("net/iavf: check illegal packet sizes")
Cc: stable@dpdk.org

Reported-by: Padraig Connolly <padraig.j.connolly@intel.com>
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 drivers/net/iavf/iavf_rxtx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index 4850b9e381..6a093c6746 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -3677,7 +3677,11 @@ iavf_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 			return i;
 		}
 
-		if (m->pkt_len < IAVF_TX_MIN_PKT_LEN) {
+		/* valid packets are greater than min size, and single-buffer pkts
+		 * must have data_len == pkt_len
+		 */
+		if (m->pkt_len < IAVF_TX_MIN_PKT_LEN ||
+				(m->nb_segs == 1 && m->data_len != m->pkt_len)) {
 			rte_errno = EINVAL;
 			return i;
 		}
-- 
2.43.0