[PATCH] hwmon: (ibmpowernv) refactor deprecated strncpy

Justin Stitt justinstitt at google.com
Fri Sep 15 09:21:06 AEST 2023

`strncpy` is deprecated for use on NUL-terminated destination strings [1].

We should prefer more robust and less ambiguous string interfaces.

A suitable replacement is `strscpy` [2] due to the fact that it
guarantees NUL-termination on the destination buffer without
unnecessarily NUL-padding since `buf` is already zero-initialized.

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 at vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt at google.com>
 drivers/hwmon/ibmpowernv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
index 594254d6a72d..57d829dbcda6 100644
--- a/drivers/hwmon/ibmpowernv.c
+++ b/drivers/hwmon/ibmpowernv.c
@@ -234,7 +234,7 @@ static int get_sensor_index_attr(const char *name, u32 *index, char *attr)
 	if (copy_len >= sizeof(buf))
 		return -EINVAL;
-	strncpy(buf, hash_pos + 1, copy_len);
+	strscpy(buf, hash_pos + 1, copy_len);
 	err = kstrtou32(buf, 10, index);
 	if (err)

base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec
change-id: 20230914-strncpy-drivers-hwmon-ibmpowernv-c-80a03f16d93a

Best regards,
Justin Stitt <justinstitt at google.com>

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