linux-kernel - [PATCH 2/2] docs/sysfs: show() methods should use scnprintf().

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Message-Id: <201012211309.47482.bvanassche@acm.org>
Date:	Tue, 21 Dec 2010 13:09:47 +0100
From:	Bart Van Assche <bvanassche@....org>
To:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	"Greg Kroah-Hartman" <gregkh@...e.de>
Subject: [PATCH 2/2] docs/sysfs: show() methods should use scnprintf().

Since snprintf() may return a value that exceeds its second argument,
show() methods should use scnprintf() instead of snprintf(). This patch
updates the example in the sysfs documentation accordingly.

Signed-off-by: Bart Van Assche <bvanassche@....org>
Cc: Greg KH <greg@...ah.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 Documentation/filesystems/sysfs.txt |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/filesystems/sysfs.txt b/Documentation/filesystems/sysfs.txt
index 2ed95f9..f806e50 100644
--- a/Documentation/filesystems/sysfs.txt
+++ b/Documentation/filesystems/sysfs.txt
@@ -210,9 +210,9 @@ Other notes:
   is 4096. 
 
 - show() methods should return the number of bytes printed into the
-  buffer. This is the return value of snprintf().
+  buffer. This is the return value of scnprintf().
 
-- show() should always use snprintf(). 
+- show() should always use scnprintf().
 
 - store() should return the number of bytes used from the buffer. If the
   entire buffer has been used, just return the count argument.
@@ -231,7 +231,7 @@ A very simple (and naive) implementation of a device attribute is:
 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
                          char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%s\n", dev->name);
+	return scnprintf(buf, PAGE_SIZE, "%s\n", dev->name);
 }
 
 static ssize_t store_name(struct device *dev, struct device_attribute *attr,
-- 
1.7.1

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