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authorOliver Neukum <oliver@neukum.org>2007-10-23 12:26:41 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-25 12:18:44 -0700
commitd718d2b17822bb92708204cb1a9175e512520261 (patch)
tree07db96751e993ceba8bed366458115d2c1ec6773 /drivers/usb/misc/cytherm.c
parent54d2bc068fd21bcb096660938bce7c7265613a24 (diff)
USB: fix read vs. disconnect race in cytherm driver
the disconnect method of this driver set intfdata to NULL before removing attribute files. The attributes' read methods will happily follow the NULL pointer. Here's the correct ordering. Signed-off-by : Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/misc/cytherm.c')
-rw-r--r--drivers/usb/misc/cytherm.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/usb/misc/cytherm.c b/drivers/usb/misc/cytherm.c
index 2677fea147d..1cd9e7eba93 100644
--- a/drivers/usb/misc/cytherm.c
+++ b/drivers/usb/misc/cytherm.c
@@ -399,7 +399,6 @@ static void cytherm_disconnect(struct usb_interface *interface)
struct usb_cytherm *dev;
dev = usb_get_intfdata (interface);
- usb_set_intfdata (interface, NULL);
device_remove_file(&interface->dev, &dev_attr_brightness);
device_remove_file(&interface->dev, &dev_attr_temp);
@@ -407,6 +406,9 @@ static void cytherm_disconnect(struct usb_interface *interface)
device_remove_file(&interface->dev, &dev_attr_port0);
device_remove_file(&interface->dev, &dev_attr_port1);
+ /* first remove the files, then NULL the pointer */
+ usb_set_intfdata (interface, NULL);
+
usb_put_dev(dev->udev);
kfree(dev);