From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Tue, 22 Mar 2016 18:10:40 +0000 (-0700)
Subject: staging: comedi: ni_tio: make ni_gpct_device_destroy() NULL pointer safe
X-Git-Tag: v4.7-rc1~90^2~581
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bed05b6c3434e62310c2e37ef234f02ce57cf74d;p=karo-tx-linux.git

staging: comedi: ni_tio: make ni_gpct_device_destroy() NULL pointer safe

Modify the pointer check to make this function NULL pointer safe.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/comedi/drivers/ni_tio.c b/drivers/staging/comedi/drivers/ni_tio.c
index b74e44ec521a..623fc6c7bff0 100644
--- a/drivers/staging/comedi/drivers/ni_tio.c
+++ b/drivers/staging/comedi/drivers/ni_tio.c
@@ -1413,7 +1413,7 @@ EXPORT_SYMBOL_GPL(ni_gpct_device_construct);
 
 void ni_gpct_device_destroy(struct ni_gpct_device *counter_dev)
 {
-	if (!counter_dev->counters)
+	if (!counter_dev)
 		return;
 	kfree(counter_dev->counters);
 	kfree(counter_dev);