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Subject[PATCH] net: dsa: realtek: replace deprecated strncpy with ethtool_sprintf
From
`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@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
---
Note: build-tested only.
---
drivers/net/dsa/realtek/rtl8366-core.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/dsa/realtek/rtl8366-core.c b/drivers/net/dsa/realtek/rtl8366-core.c
index dc5f75be3017..b13766a3acbb 100644
--- a/drivers/net/dsa/realtek/rtl8366-core.c
+++ b/drivers/net/dsa/realtek/rtl8366-core.c
@@ -395,16 +395,13 @@ void rtl8366_get_strings(struct dsa_switch *ds, int port, u32 stringset,
uint8_t *data)
{
struct realtek_priv *priv = ds->priv;
- struct rtl8366_mib_counter *mib;
int i;

if (port >= priv->num_ports)
return;

for (i = 0; i < priv->num_mib_counters; i++) {
- mib = &priv->mib_counters[i];
- strncpy(data + i * ETH_GSTRING_LEN,
- mib->name, ETH_GSTRING_LEN);
+ ethtool_sprintf(&data, "%s", priv->mib_counters[i].name);
}
}
EXPORT_SYMBOL_GPL(rtl8366_get_strings);
---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231009-strncpy-drivers-net-dsa-realtek-rtl8366-core-c-60a0f0ddc5cc
Best regards,
--
Justin Stitt <justinstitt@google.com>

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