From: Oliver Neukum Date: Tue, 23 Oct 2007 10:26:41 +0000 (+0200) Subject: USB: fix read vs. disconnect race in cytherm driver X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=d718d2b17822bb92708204cb1a9175e512520261;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/misc/cytherm.c b/drivers/usb/misc/cytherm.c index 2677fea147d9..1cd9e7eba93b 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);