From 9fc950d322380dda8e9bc8debe89766085e7a0eb Mon Sep 17 00:00:00 2001 From: Simon Arlott Date: Sat, 21 Nov 2009 15:33:51 +0000 Subject: USB: cxacru: check device isn't being removed during sysfs calls It is possible for usb_get_intfdata() to return NULL if sysfs is accessed while the module is being unloaded or the device is being removed. Move the access code to an inline function in usbatm.h, and return -ENODEV if any of the pointers are NULL. It should not be possible for the instance data or atm device to be invalid until after unbind() completes and the sysfs attributes have been removed. Signed-off-by: Simon Arlott Signed-off-by: Greg Kroah-Hartman --- drivers/usb/atm/usbatm.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'drivers/usb/atm/usbatm.h') diff --git a/drivers/usb/atm/usbatm.h b/drivers/usb/atm/usbatm.h index f6f4508a9d42..0863f85fcc26 100644 --- a/drivers/usb/atm/usbatm.h +++ b/drivers/usb/atm/usbatm.h @@ -204,4 +204,19 @@ struct usbatm_data { struct urb *urbs[0]; }; +static inline void *to_usbatm_driver_data(struct usb_interface *intf) +{ + struct usbatm_data *usbatm_instance; + + if (intf == NULL) + return NULL; + + usbatm_instance = usb_get_intfdata(intf); + + if (usbatm_instance == NULL) /* set NULL before unbind() */ + return NULL; + + return usbatm_instance->driver_data; /* set NULL after unbind() */ +} + #endif /* _USBATM_H_ */ -- cgit v1.2.3