[dpdk-dev] [v2] drivers/net: fix dereference after null check coverity

[Xiao Zhang]

This patch tries to fix the coverity issues of dereference after null
check.
The addresses of receive queue start segment for ice, avf, i40e, 
fm10k and ixgb were not checked before use. Add check to avoid
coverity issues.

Coverity issue: 343452
Coverity issue: 343407
Fixes: c68a52b8 ("net/ice: support vector SSE in Rx")
Coverity issue: 343447
Fixes: 319c421f ("net/avf: enable SSE Rx Tx")
Coverity issue: 343422
Coverity issue: 343403
Fixes: ca74903b ("net/i40e: extract non-x86 specific code from vector driver")
Coverity issue: 343416
Fixes: fe65e1e1 ("fm10k: add vector scatter Rx")
Coverity issue: 13245
Fixes: 8a44c15a ("net/ixgbe: extract non-x86 specific code from vector driver")
Cc: stable at dpdk.org

Signed-off-by: Xiao Zhang <xiao.zhang at intel.com>
---
v2 changes:
* update commit log with fixes information.

 drivers/net/fm10k/fm10k_rxtx_vec.c        | 3 +++
 drivers/net/i40e/i40e_rxtx_vec_common.h   | 3 +++
 drivers/net/iavf/iavf_rxtx_vec_common.h   | 3 +++
 drivers/net/ice/ice_rxtx_vec_common.h     | 3 +++
 drivers/net/ixgbe/ixgbe_rxtx_vec_common.h | 3 +++
 5 files changed, 15 insertions(+)

diff --git a/drivers/net/fm10k/fm10k_rxtx_vec.c b/drivers/net/fm10k/fm10k_rxtx_vec.c
index 788e248..cb840de 100644
--- a/drivers/net/fm10k/fm10k_rxtx_vec.c
+++ b/drivers/net/fm10k/fm10k_rxtx_vec.c
@@ -602,6 +602,9 @@ fm10k_reassemble_packets(struct fm10k_rx_queue *rxq,
 	struct rte_mbuf *end =  rxq->pkt_last_seg;
 	unsigned pkt_idx, buf_idx;
 
+	if (!start)
+		return 0;
+
 	for (buf_idx = 0, pkt_idx = 0; buf_idx < nb_bufs; buf_idx++) {
 		if (end != NULL) {
 			/* processing a split packet */
diff --git a/drivers/net/i40e/i40e_rxtx_vec_common.h b/drivers/net/i40e/i40e_rxtx_vec_common.h
index 0e6ffa0..1351e41 100644
--- a/drivers/net/i40e/i40e_rxtx_vec_common.h
+++ b/drivers/net/i40e/i40e_rxtx_vec_common.h
@@ -20,6 +20,9 @@ reassemble_packets(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_bufs,
 	struct rte_mbuf *end =  rxq->pkt_last_seg;
 	unsigned pkt_idx, buf_idx;
 
+	if (!start)
+		return 0;
+
 	for (buf_idx = 0, pkt_idx = 0; buf_idx < nb_bufs; buf_idx++) {
 		if (end != NULL) {
 			/* processing a split packet */
diff --git a/drivers/net/iavf/iavf_rxtx_vec_common.h b/drivers/net/iavf/iavf_rxtx_vec_common.h
index db509d7..ac3d62a 100644
--- a/drivers/net/iavf/iavf_rxtx_vec_common.h
+++ b/drivers/net/iavf/iavf_rxtx_vec_common.h
@@ -20,6 +20,9 @@ reassemble_packets(struct iavf_rx_queue *rxq, struct rte_mbuf **rx_bufs,
 	struct rte_mbuf *end =  rxq->pkt_last_seg;
 	unsigned int pkt_idx, buf_idx;
 
+	if (!start)
+		return 0;
+
 	for (buf_idx = 0, pkt_idx = 0; buf_idx < nb_bufs; buf_idx++) {
 		if (end) {
 			/* processing a split packet */
diff --git a/drivers/net/ice/ice_rxtx_vec_common.h b/drivers/net/ice/ice_rxtx_vec_common.h
index c5f0d56..11da521 100644
--- a/drivers/net/ice/ice_rxtx_vec_common.h
+++ b/drivers/net/ice/ice_rxtx_vec_common.h
@@ -16,6 +16,9 @@ ice_rx_reassemble_packets(struct ice_rx_queue *rxq, struct rte_mbuf **rx_bufs,
 	struct rte_mbuf *end =  rxq->pkt_last_seg;
 	unsigned int pkt_idx, buf_idx;
 
+	if (!start)
+		return 0;
+
 	for (buf_idx = 0, pkt_idx = 0; buf_idx < nb_bufs; buf_idx++) {
 		if (end) {
 			/* processing a split packet */
diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_common.h b/drivers/net/ixgbe/ixgbe_rxtx_vec_common.h
index a97c271..a95cc0a 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx_vec_common.h
+++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_common.h
@@ -19,6 +19,9 @@ reassemble_packets(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_bufs,
 	struct rte_mbuf *end =  rxq->pkt_last_seg;
 	unsigned int pkt_idx, buf_idx;
 
+	if (!start)
+		return 0;
+
 	for (buf_idx = 0, pkt_idx = 0; buf_idx < nb_bufs; buf_idx++) {
 		if (end != NULL) {
 			/* processing a split packet */
-- 
2.7.4