hwmon: (dell-smm) Use strscpy_pad()

Using strscpy_pad() allows for fewer memory accesses
since memset() will not unconditionally zero-out
the whole buffer.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Acked-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20211021190531.17379-3-W_Armin@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 9773d6c..b0c591b 100644 (file)
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -25,6 +25,7 @@
 #include <linux/platform_device.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/string.h>
 #include <linux/smp.h>
 #include <linux/types.h>
 #include <linux/uaccess.h>
@@ -472,8 +473,7 @@ i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd
                if (restricted && !capable(CAP_SYS_ADMIN))
                        return -EPERM;
 
-               memset(buff, 0, sizeof(buff));
-               strscpy(buff, data->bios_machineid, sizeof(buff));
+               strscpy_pad(buff, data->bios_machineid, sizeof(buff));
                break;
 
        case I8K_FN_STATUS: