wifi: ath5k: replace deprecated strncpy with strscpy

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

We expect led->name to be NUL-terminated based on the presence of a
manual NUL-byte assignment.

This NUL-byte assignment was added in Commit daf9669bea30aa22 ("ath5k:
ensure led name is null terminated"). If strscpy() had existed and had
been used back when this code was written then potential bugs and the
need to manually NUL-terminate could have been avoided. Since we now
have the technology, let's use it :)

Considering the above, a suitable replacement is `strscpy` [2] due to
the fact that it guarantees NUL-termination on the destination buffer
without unnecessarily NUL-padding. If NUL-padding is required let's opt
for strscpy_pad().

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
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20231013-strncpy-drivers-net-wireless-ath-ath5k-led-c-v1-1-3acb0b5a21f2@google.com

diff --git a/drivers/net/wireless/ath/ath5k/led.c b/drivers/net/wireless/ath/ath5k/led.c
index 33e9928af36354dda8848a50f93ea53523a9e694..439052984796789f8ef9d569365100d4834168a1 100644 (file)
--- a/drivers/net/wireless/ath/ath5k/led.c
+++ b/drivers/net/wireless/ath/ath5k/led.c
@@ -131,8 +131,7 @@ ath5k_register_led(struct ath5k_hw *ah, struct ath5k_led *led,
        int err;
 
        led->ah = ah;
-       strncpy(led->name, name, sizeof(led->name));
-       led->name[sizeof(led->name)-1] = 0;
+       strscpy(led->name, name, sizeof(led->name));
        led->led_dev.name = led->name;
        led->led_dev.default_trigger = trigger;
        led->led_dev.brightness_set = ath5k_led_brightness_set;