linux-kernel - [PATCH] tty: vt: replace snprintf in show functions with sysfs

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Message-Id: <1634280696-5056-1-git-send-email-wangqing@vivo.com>
Date:   Thu, 14 Oct 2021 23:51:36 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH] tty: vt: replace snprintf in show functions with sysfs_emit

show() must not use snprintf() when formatting the value to be
returned to user space.

Fix the following coccicheck warning:
drivers/tty/vt/vt.c:3902: WARNING: use scnprintf or sprintf.
drivers/tty/vt/vt.c:3910: WARNING: use scnprintf or sprintf.

Signed-off-by: Qing Wang <wangqing@...o.com>
---
 drivers/tty/vt/vt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index ef981d3..ea44ea1 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -3899,7 +3899,7 @@ static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
 	bind = con_is_bound(con->con);
 	console_unlock();
 
-	return snprintf(buf, PAGE_SIZE, "%i\n", bind);
+	return sysfs_emit(buf, "%i\n", bind);
 }
 
 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
@@ -3907,7 +3907,7 @@ static ssize_t show_name(struct device *dev, struct device_attribute *attr,
 {
 	struct con_driver *con = dev_get_drvdata(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%s %s\n",
+	return sysfs_emit(buf, "%s %s\n",
 			(con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
 			 con->desc);
 
-- 
2.7.4