[dpdk-stable] [PATCH v3] kni: fix build with gcc 8.1

[Ferruh Yigit]

Error observed when CONFIG_RTE_KNI_KMOD_ETHTOOL config option is
enabled.

build error:
In function ‘strncpy’,
    inlined from ‘igb_get_drvinfo’ at
    .../dpdk/build/build/kernel/linux/kni/igb_ethtool.c:814:2:
    .../include/linux/string.h:246:9: error: ‘__builtin_strncpy’ output
    may be truncated copying 31 bytes from a string of length 42
    [-Werror=stringop-truncation]
      return __builtin_strncpy(p, q, size);
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixed by using strlcpy instead of strncpy.

adapter->fw_version size kept same because of
c3698192940c ("kni: fix build with gcc 7.1")

Also next line strncpy usage replaced with strlcpy while arround.

Fixes: c3698192940c ("kni: fix build with gcc 7.1")
Cc: stable at dpdk.org

Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>
---
v2:
* used strlcpy instead of strncpy
* Updated strncpy usage in next line to strlcpy too
* Added fixes line

v3:
* fix patch syntax corrupted during send
---
 kernel/linux/kni/ethtool/igb/igb_ethtool.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/linux/kni/ethtool/igb/igb_ethtool.c b/kernel/linux/kni/ethtool/igb/igb_ethtool.c
index 064528bcf..002f75c48 100644
--- a/kernel/linux/kni/ethtool/igb/igb_ethtool.c
+++ b/kernel/linux/kni/ethtool/igb/igb_ethtool.c
@@ -811,9 +811,10 @@ static void igb_get_drvinfo(struct net_device *netdev,
 	strncpy(drvinfo->driver,  igb_driver_name, sizeof(drvinfo->driver) - 1);
 	strncpy(drvinfo->version, igb_driver_version, sizeof(drvinfo->version) - 1);
 
-	strncpy(drvinfo->fw_version, adapter->fw_version,
-		sizeof(drvinfo->fw_version) - 1);
-	strncpy(drvinfo->bus_info, pci_name(adapter->pdev), sizeof(drvinfo->bus_info) -1);
+	strlcpy(drvinfo->fw_version, adapter->fw_version,
+		sizeof(drvinfo->fw_version));
+	strlcpy(drvinfo->bus_info, pci_name(adapter->pdev),
+		sizeof(drvinfo->bus_info));
 	drvinfo->n_stats = IGB_STATS_LEN;
 	drvinfo->testinfo_len = IGB_TEST_LEN;
 	drvinfo->regdump_len = igb_get_regs_len(netdev);
-- 
2.17.1