platform/x86: dell-wmi-sysman: Change user experience when Admin/System Password is modified

Whenever user has changed an Admin/System Password using the sysfs,
then we are automatically copying the new password to existing
password field.

Co-developed-by: Divya Bharathi <divya.bharathi@dell.com>
Signed-off-by: Divya Bharathi <divya.bharathi@dell.com>
Signed-off-by: Prasanth KSR <prasanth.ksr@dell.com>
Link: https://lore.kernel.org/r/20210628084906.4233-1-prasanth.ksr@dell.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Author: prasanthksr

drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c

@@ -95,9 +95,9 @@ int set_new_password(const char *password_type, const char *new)
 
 	print_hex_dump_bytes("set new password data: ", DUMP_PREFIX_NONE, buffer, buffer_size);
 	ret = call_password_interface(wmi_priv.password_attr_wdev, buffer, buffer_size);
-	/* clear current_password here and use user input from wmi_priv.current_password */
+	/* on success copy the new password to current password */
 	if (!ret)
-		memset(current_password, 0, MAX_BUFF);
+		strscpy(current_password, new, MAX_BUFF);
 	/* explain to user the detailed failure reason */
 	else if (ret == -EOPNOTSUPP)
 		dev_err(&wmi_priv.password_attr_wdev->dev, "admin password must be configured\n");