linux-kernel - [PATCH] serial: core: don't use snprintf() for formatting sysfs attrs

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Message-Id: <20200824223932.27709-1-alex.dewar90@gmail.com>
Date:   Mon, 24 Aug 2020 23:39:33 +0100
From:   Alex Dewar <alex.dewar90@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Alex Dewar <alex.dewar90@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] serial: core: don't use snprintf() for formatting sysfs attrs

As per the documentation (Documentation/filesystems/sysfs.rst),
snprintf() should not be used for formatting values returned by sysfs.

For all of the instances in serial_core.c, we know that the string will
be <PAGE_SIZE in length, so just use sprintf().

Issue identified by Coccinelle.

Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
---
 drivers/tty/serial/serial_core.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index f797c971cd82f..4d313385cb2a7 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2637,7 +2637,7 @@ static ssize_t uartclk_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16);
+	return sprintf(buf, "%d\n", tmp.baud_base * 16);
 }
 
 static ssize_t type_show(struct device *dev,
@@ -2647,7 +2647,7 @@ static ssize_t type_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type);
+	return sprintf(buf, "%d\n", tmp.type);
 }
 
 static ssize_t line_show(struct device *dev,
@@ -2657,7 +2657,7 @@ static ssize_t line_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line);
+	return sprintf(buf, "%d\n", tmp.line);
 }
 
 static ssize_t port_show(struct device *dev,
@@ -2671,7 +2671,7 @@ static ssize_t port_show(struct device *dev,
 	ioaddr = tmp.port;
 	if (HIGH_BITS_OFFSET)
 		ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET;
-	return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr);
+	return sprintf(buf, "0x%lX\n", ioaddr);
 }
 
 static ssize_t irq_show(struct device *dev,
@@ -2681,7 +2681,7 @@ static ssize_t irq_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq);
+	return sprintf(buf, "%d\n", tmp.irq);
 }
 
 static ssize_t flags_show(struct device *dev,
@@ -2691,7 +2691,7 @@ static ssize_t flags_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags);
+	return sprintf(buf, "0x%X\n", tmp.flags);
 }
 
 static ssize_t xmit_fifo_size_show(struct device *dev,
@@ -2701,7 +2701,7 @@ static ssize_t xmit_fifo_size_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size);
+	return sprintf(buf, "%d\n", tmp.xmit_fifo_size);
 }
 
 static ssize_t close_delay_show(struct device *dev,
@@ -2711,7 +2711,7 @@ static ssize_t close_delay_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay);
+	return sprintf(buf, "%d\n", tmp.close_delay);
 }
 
 static ssize_t closing_wait_show(struct device *dev,
@@ -2721,7 +2721,7 @@ static ssize_t closing_wait_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait);
+	return sprintf(buf, "%d\n", tmp.closing_wait);
 }
 
 static ssize_t custom_divisor_show(struct device *dev,
@@ -2731,7 +2731,7 @@ static ssize_t custom_divisor_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor);
+	return sprintf(buf, "%d\n", tmp.custom_divisor);
 }
 
 static ssize_t io_type_show(struct device *dev,
@@ -2741,7 +2741,7 @@ static ssize_t io_type_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type);
+	return sprintf(buf, "%d\n", tmp.io_type);
 }
 
 static ssize_t iomem_base_show(struct device *dev,
@@ -2751,7 +2751,7 @@ static ssize_t iomem_base_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base);
+	return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base);
 }
 
 static ssize_t iomem_reg_shift_show(struct device *dev,
@@ -2761,7 +2761,7 @@ static ssize_t iomem_reg_shift_show(struct device *dev,
 	struct tty_port *port = dev_get_drvdata(dev);
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift);
+	return sprintf(buf, "%d\n", tmp.iomem_reg_shift);
 }
 
 static ssize_t console_show(struct device *dev,
-- 
2.28.0