net: dsa: qca8k: 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 more robust and easier to
understand interface.

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: Kees Cook <keescook@chromium.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20231009-strncpy-drivers-net-dsa-qca-qca8k-common-c-v1-1-34c8040e0f32@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/dsa/qca/qca8k-common.c b/drivers/net/dsa/qca/qca8k-common.c
index fce04ce12cf985b4a427b4ecf78959273cc4eec4..9ff0a3c1cb91d55574386a24dacaf9ebe7f73075 100644 (file)
--- a/drivers/net/dsa/qca/qca8k-common.c
+++ b/drivers/net/dsa/qca/qca8k-common.c
@@ -487,8 +487,7 @@ void qca8k_get_strings(struct dsa_switch *ds, int port, u32 stringset,
                return;
 
        for (i = 0; i < priv->info->mib_count; i++)
-               strncpy(data + i * ETH_GSTRING_LEN, ar8327_mib[i].name,
-                       ETH_GSTRING_LEN);
+               ethtool_sprintf(&data, "%s", ar8327_mib[i].name);
 }
 
 void qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,