linux-kernel - [PATCH] staging: unisys: virtpci: virtpci.c: Fix for possible null pointer dereference

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Date:	Sun, 14 Dec 2014 23:41:11 +0100
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Benjamin Romer <benjamin.romer@...sys.com>,
	David Kershner <david.kershner@...sys.com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ken Cox <jkc@...hat.com>,
	Erik Arfvidson <erik.arfvidson@...sys.com>,
	Silvio F <silvio.fricke@...il.com>, sparmaintainer@...sys.com,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: unisys: virtpci: virtpci.c:  Fix for possible null pointer dereference

There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/staging/unisys/virtpci/virtpci.c |   23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/unisys/virtpci/virtpci.c b/drivers/staging/unisys/virtpci/virtpci.c
index ee9f826..d818eda 100644
--- a/drivers/staging/unisys/virtpci/virtpci.c
+++ b/drivers/staging/unisys/virtpci/virtpci.c
@@ -1314,15 +1314,13 @@ static ssize_t virtpci_driver_attr_show(struct kobject *kobj,
 	ssize_t ret = 0;
 
 	struct driver_private *dprivate = to_driver(kobj);
-	struct device_driver *driver;
 
-	if (dprivate != NULL)
-		driver = dprivate->driver;
-	else
-		driver = NULL;
+	if (dprivate) {
+		struct device_driver *driver = dprivate->driver;
+
+		DBGINF("In virtpci_driver_attr_show driver->name:%s\n",
+				driver->name);
 
-	DBGINF("In virtpci_driver_attr_show driver->name:%s\n", driver->name);
-	if (driver) {
 		if (dattr->show)
 			ret = dattr->show(driver, buf);
 	}
@@ -1337,16 +1335,13 @@ static ssize_t virtpci_driver_attr_store(struct kobject *kobj,
 	ssize_t ret = 0;
 
 	struct driver_private *dprivate = to_driver(kobj);
-	struct device_driver *driver;
 
-	if (dprivate != NULL)
-		driver = dprivate->driver;
-	else
-		driver = NULL;
+	if (dprivate) {
+		struct device_driver *driver = dprivate->driver;
 
-	DBGINF("In virtpci_driver_attr_store driver->name:%s\n", driver->name);
+		DBGINF("In virtpci_driver_attr_store driver->name:%s\n",
+				driver->name);
 
-	if (driver) {
 		if (dattr->store)
 			ret = dattr->store(driver, buf, count);
 	}
-- 
1.7.10.4

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