linux-kernel - [PATCH 7/8] HID: roccat: Fixed NULL pointer dereference when unloading module

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Date:	Sun, 30 Jan 2011 13:38:27 +0100
From:	Stefan Achatz <erazor_de@...rs.sourceforge.net>
To:	Randy Dunlap <rdunlap@...otime.net>, Jiri Kosina <jkosina@...e.cz>,
	Stefan Achatz <erazor_de@...rs.sourceforge.net>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Weber <weber@...science.de>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH 7/8] HID: roccat: Fixed NULL pointer dereference when
 unloading module

Class was destroyed before starting the unregistering driver chain.
Disconnecting a device from roccat chardev in this process then
raised a NULL pointer dereference.
Fixed this by destroying class after unregistering driver.

Signed-off-by: Stefan Achatz <erazor_de@...rs.sourceforge.net>
---
 drivers/hid/hid-roccat-arvo.c     |    2 +-
 drivers/hid/hid-roccat-kone.c     |    2 +-
 drivers/hid/hid-roccat-koneplus.c |    2 +-
 drivers/hid/hid-roccat-kovaplus.c |    2 +-
 drivers/hid/hid-roccat-pyra.c     |    2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/hid-roccat-arvo.c b/drivers/hid/hid-roccat-arvo.c
index 7b9a992..75f532f 100644
--- a/drivers/hid/hid-roccat-arvo.c
+++ b/drivers/hid/hid-roccat-arvo.c
@@ -438,8 +438,8 @@ static int __init arvo_init(void)
 
 static void __exit arvo_exit(void)
 {
-	class_destroy(arvo_class);
 	hid_unregister_driver(&arvo_driver);
+	class_destroy(arvo_class);
 }
 
 module_init(arvo_init);
diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-roccat-kone.c
index 5cdb282..d749796 100644
--- a/drivers/hid/hid-roccat-kone.c
+++ b/drivers/hid/hid-roccat-kone.c
@@ -844,8 +844,8 @@ static int __init kone_init(void)
 
 static void __exit kone_exit(void)
 {
-	class_destroy(kone_class);
 	hid_unregister_driver(&kone_driver);
+	class_destroy(kone_class);
 }
 
 module_init(kone_init);
diff --git a/drivers/hid/hid-roccat-koneplus.c b/drivers/hid/hid-roccat-koneplus.c
index 7367e4e..ac20107 100644
--- a/drivers/hid/hid-roccat-koneplus.c
+++ b/drivers/hid/hid-roccat-koneplus.c
@@ -774,8 +774,8 @@ static int __init koneplus_init(void)
 
 static void __exit koneplus_exit(void)
 {
-	class_destroy(koneplus_class);
 	hid_unregister_driver(&koneplus_driver);
+	class_destroy(koneplus_class);
 }
 
 module_init(koneplus_init);
diff --git a/drivers/hid/hid-roccat-kovaplus.c b/drivers/hid/hid-roccat-kovaplus.c
index 7664e2c..4eeb62f 100644
--- a/drivers/hid/hid-roccat-kovaplus.c
+++ b/drivers/hid/hid-roccat-kovaplus.c
@@ -703,8 +703,8 @@ static int __init kovaplus_init(void)
 
 static void __exit kovaplus_exit(void)
 {
-	class_destroy(kovaplus_class);
 	hid_unregister_driver(&kovaplus_driver);
+	class_destroy(kovaplus_class);
 }
 
 module_init(kovaplus_init);
diff --git a/drivers/hid/hid-roccat-pyra.c b/drivers/hid/hid-roccat-pyra.c
index be4daa9..02a7243 100644
--- a/drivers/hid/hid-roccat-pyra.c
+++ b/drivers/hid/hid-roccat-pyra.c
@@ -685,8 +685,8 @@ static int __init pyra_init(void)
 
 static void __exit pyra_exit(void)
 {
-	class_destroy(pyra_class);
 	hid_unregister_driver(&pyra_driver);
+	class_destroy(pyra_class);
 }
 
 module_init(pyra_init);
-- 
1.7.3.4



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