[RFT] vmxnet3: coverity reported defect

[Stephen Hemminger <stephen@networkplumber.org>]

I noticed Coverity defect in DPDK number 124563 was assigned to me.

It looks like vmxnet3 driver code doesn't handle case where host incorrectly
sends a frame with out setting SOP bit in first segment. This would lead to
rxq->start_seq being NULL.

Maybe something like this would fix it.  I don't have VMware (or time) to test.

diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index 57557492e0f5..3118d94add90 100644
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -813,6 +813,13 @@ vmxnet3_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 
 			RTE_ASSERT(rxd->btype == VMXNET3_RXD_BTYPE_BODY);
 
+			if (unlikely(start == NULL)) {
+				PMD_RX_LOG(ERR, "Missing sop");
+
+				rte_pktmbuf_free_seg(rxm);
+				goto rcd_done;
+			}
+
 			start->pkt_len += rxm->data_len;
 			start->nb_segs++;
 

PS: the email for the VMXNET3 maintainer  Shrikrishna Khare <skhare@vmware.com> bounces.