net: phy: smsc: replace deprecated strncpy with ethtool_sprintf

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 dedicated helper function.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html
Link: https://github.com/KSPP/linux/issues/90
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231012-strncpy-drivers-net-phy-smsc-c-v1-1-00528f7524b3@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index c88edb19d2e7101a3a7d52e2110f60d03e7c7db6..1c7306a1af131416d83120918822c9ba218a49dd 100644 (file)
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -507,10 +507,8 @@ static void smsc_get_strings(struct phy_device *phydev, u8 *data)
 {
        int i;
 
-       for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++) {
-               strncpy(data + i * ETH_GSTRING_LEN,
-                      smsc_hw_stats[i].string, ETH_GSTRING_LEN);
-       }
+       for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++)
+               ethtool_sprintf(&data, "%s", smsc_hw_stats[i].string);
 }
 
 static u64 smsc_get_stat(struct phy_device *phydev, int i)