linux-kernel - [PATCH] drivers: acpi: fan.c move a dereference below the NULL test

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Date:	Thu, 11 Feb 2010 20:56:42 +1100
From:	Darren Jenkins <darrenrjenkins@...il.com>
To:	Len Brown <lenb@...nel.org>
Cc:	Zhang Rui <rui.zhang@...el.com>, Thomas Renninger <trenn@...e.de>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Matthew Garrett <mjg@...hat.com>,
	linux ACPI <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Janitors <kernel-janitors@...r.kernel.org>
Subject: [PATCH] drivers: acpi: fan.c move a dereference below the NULL test

In acpi_fan_remove() device is being dereferenced before the NULL test.
This reorders the code to ensure it is checked for NULL first.

Coverity CID: 2758

Signed-off-by: Darren Jenkins <darrenrjenkins@...il.com>
---
 drivers/acpi/fan.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index acf2ab2..dc39640 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -298,9 +298,14 @@ static int acpi_fan_add(struct acpi_device *device)
 
 static int acpi_fan_remove(struct acpi_device *device, int type)
 {
-	struct thermal_cooling_device *cdev = acpi_driver_data(device);
+	struct thermal_cooling_device *cdev;
+
+	if (!device)
+		return -EINVAL;
+
+	cdev = acpi_driver_data(device);
 
-	if (!device || !cdev)
+	if (!cdev)
 		return -EINVAL;
 
 	acpi_fan_remove_fs(device);
-- 
1.6.3.3




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