[PATCH] net: dsa: lantiq_gswip: replace deprecated strncpy with ethtool_sprintf

[Justin Stitt]

`strncpy` is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

ethtool_sprintf() is designed specifically for get_strings() usage.
Let's replace strncpy in favor of this more robust and easier to
understand interface.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@xxxxxxxxxxxxxxx
Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx>
---
Note: build-tested only.
---
 drivers/net/dsa/lantiq_gswip.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 3c76a1a14aee..d60bc2e37701 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -1759,8 +1759,7 @@ static void gswip_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(gswip_rmon_cnt); i++)
-		strncpy(data + i * ETH_GSTRING_LEN, gswip_rmon_cnt[i].name,
-			ETH_GSTRING_LEN);
+		ethtool_sprintf(&data, "%s", gswip_rmon_cnt[i].name);
 }
 
 static u32 gswip_bcm_ram_entry_read(struct gswip_priv *priv, u32 table,

---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231005-strncpy-drivers-net-dsa-lantiq_gswip-c-ece909a364f7

Best regards,
--
Justin Stitt <justinstitt@xxxxxxxxxx>