[PATCH v2] scsi: hpsa: Replace deprecated strncpy() with strscpy()

[Thorsten Blum <thorsten.blum@linux.dev>]

strncpy() is deprecated for NUL-terminated destination buffers. Use
strscpy() instead and remove the manual NUL-termination.

Use min() to simplify the size calculation.

Compile-tested only.

Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Suggested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
Changes in v2:
- Adjust len to copy the same number of bytes as with strncpy()
- Link to v1: https://lore.kernel.org/r/34BB4FDE-062D-4C1B-B246-86CB55F631B8@linux.dev/
---
 drivers/scsi/hpsa.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 84d8de07b7ae..c7ebae24b09f 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -460,9 +460,8 @@ static ssize_t host_store_hp_ssd_smart_path_status(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 		return -EACCES;
-	len = count > sizeof(tmpbuf) - 1 ? sizeof(tmpbuf) - 1 : count;
-	strncpy(tmpbuf, buf, len);
-	tmpbuf[len] = '\0';
+	len = min(count + 1, sizeof(tmpbuf));
+	strscpy(tmpbuf, buf, len);
 	if (sscanf(tmpbuf, "%d", &status) != 1)
 		return -EINVAL;
 	h = shost_to_hba(shost);
@@ -484,9 +483,8 @@ static ssize_t host_store_raid_offload_debug(struct device *dev,
 
 	if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 		return -EACCES;
-	len = count > sizeof(tmpbuf) - 1 ? sizeof(tmpbuf) - 1 : count;
-	strncpy(tmpbuf, buf, len);
-	tmpbuf[len] = '\0';
+	len = min(count + 1, sizeof(tmpbuf));
+	strscpy(tmpbuf, buf, len);
 	if (sscanf(tmpbuf, "%d", &debug_level) != 1)
 		return -EINVAL;
 	if (debug_level < 0)
-- 
2.48.1