[dpdk-dev] [PATCH] net/txgbe: fix null pointer check problem

["Min Hu (Connor)" <humin29@huawei.com>]

From: HongBo Zheng <zhenghongbo3@huawei.com>

In function cons_parse_ntuple_filter, item->spec and item->mask
should be confirmed not null before use memcmp on it, current
judgement (item->spec || item->mask) just can confirm item->spec
or item->mask is not null, and cause null pointer be used in
memcmp.

This patch fix this problem.

Fixes: b7eeecb17556 ("net/txgbe: parse n-tuple filter")
Cc: stable@dpdk.org

Signed-off-by: HongBo Zheng <zhenghongbo3@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
---
 drivers/net/txgbe/txgbe_flow.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/net/txgbe/txgbe_flow.c b/drivers/net/txgbe/txgbe_flow.c
index 57a4f2e..35026ee 100644
--- a/drivers/net/txgbe/txgbe_flow.c
+++ b/drivers/net/txgbe/txgbe_flow.c
@@ -240,11 +240,10 @@ cons_parse_ntuple_filter(const struct rte_flow_attr *attr,
 			return -rte_errno;
 		}
 		/* if the first item is MAC, the content should be NULL */
-		if ((item->spec || item->mask) &&
-			(memcmp(eth_spec, &eth_null,
-				sizeof(struct rte_flow_item_eth)) ||
-			 memcmp(eth_mask, &eth_null,
-				sizeof(struct rte_flow_item_eth)))) {
+		if ((item->spec && memcmp(eth_spec, &eth_null,
+					  sizeof(struct rte_flow_item_eth))) ||
+		    (item->mask && memcmp(eth_mask, &eth_null,
+					  sizeof(struct rte_flow_item_eth)))) {
 			rte_flow_error_set(error, EINVAL,
 				RTE_FLOW_ERROR_TYPE_ITEM,
 				item, "Not supported by ntuple filter");
@@ -272,11 +271,10 @@ cons_parse_ntuple_filter(const struct rte_flow_attr *attr,
 			return -rte_errno;
 		}
 		/* the content should be NULL */
-		if ((item->spec || item->mask) &&
-			(memcmp(vlan_spec, &vlan_null,
-				sizeof(struct rte_flow_item_vlan)) ||
-			 memcmp(vlan_mask, &vlan_null,
-				sizeof(struct rte_flow_item_vlan)))) {
+		if ((item->spec && memcmp(vlan_spec, &vlan_null,
+					  sizeof(struct rte_flow_item_vlan))) ||
+		    (item->mask && memcmp(vlan_mask, &vlan_null,
+					  sizeof(struct rte_flow_item_vlan)))) {
 			rte_flow_error_set(error, EINVAL,
 				RTE_FLOW_ERROR_TYPE_ITEM,
 				item, "Not supported by ntuple filter");
-- 
2.7.4