[dpdk-dev] [PATCH 3/4] net/hns3: fix unintended sign extension in fd operation

["Wei Hu (Xavier)" <xavier.huwei@huawei.com>]

Currently, there are coverity defects warning as below:

CID 349937 (#1 of 1): Unintended sign extension (SIGN_EXTENSION)
sign_extension: Suspicious implicit sign extension: port_number with type
uint16_t (16 bits, unsigned) is promoted in port_number << cur_pos to type
int (32 bits, signed), then sign-extended to type unsigned long (64 bits,
unsigned). If port_number << cur_pos is greater than 0x7FFFFFFF, the upper
bits of the result will all be 1.

CID 349893 (#1 of 1): Unintended sign extension (SIGN_EXTENSION)
sign_extension: Suspicious implicit sign extension: vlan_tag with type
uint8_t (8 bits, unsigned) is promoted in vlan_tag << cur_pos to type int
(32 bits, signed), then sign-extended to type unsigned long (64 bits,
unsigned). If vlan_tag << cur_pos is greater than 0x7FFFFFFF, the upper
bits of the result will all be 1.

This patch fixes them by replacing the data type of port_number and
vlan_tag with uint32_t in the inner static function named
hns3_fd_convert_meta_data of hns3 PMD driver.

Coverity issue: 349937, 349893
Fixes: fcba820d9b9e ("net/hns3: support flow director")
Cc: stable@dpdk.org

Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
---
 drivers/net/hns3/hns3_fdir.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hns3/hns3_fdir.c b/drivers/net/hns3/hns3_fdir.c
index 7bc5bf8..6ab439d 100644
--- a/drivers/net/hns3/hns3_fdir.c
+++ b/drivers/net/hns3/hns3_fdir.c
@@ -619,7 +619,7 @@ static void hns3_fd_convert_meta_data(struct hns3_fd_key_cfg *cfg,
 				      uint8_t *key_x, uint8_t *key_y)
 {
 	uint16_t meta_data = 0;
-	uint16_t port_number;
+	uint32_t port_number;
 	uint8_t cur_pos = 0;
 	uint8_t tuple_size;
 	uint8_t shift_bits;
@@ -637,7 +637,7 @@ static void hns3_fd_convert_meta_data(struct hns3_fd_key_cfg *cfg,
 				     rule->key_conf.spec.tunnel_type ? 1 : 0);
 			cur_pos += tuple_size;
 		} else if (i == VLAN_NUMBER) {
-			uint8_t vlan_tag;
+			uint32_t vlan_tag;
 			uint8_t vlan_num;
 			if (rule->key_conf.spec.tunnel_type == 0)
 				vlan_num = rule->key_conf.vlan_num;
-- 
2.7.4