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[v2,2/5] hwmon: (dell-smm) Use strscpy_pad()

Message ID 20211021190531.17379-3-W_Armin@gmx.de (mailing list archive)
State Accepted
Headers show
Series hwmon: (dell-smm) Miscellaneous Improvments | expand

Commit Message

Armin Wolf Oct. 21, 2021, 7:05 p.m. UTC 
From: Armin Wolf <W_Armin@gmx.de>

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>
---
 drivers/hwmon/dell-smm-hwmon.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--
2.20.1
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Patch

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 9773d6c0477a..b0c591bb761a 100644
--- 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: