Commit 9fc950d3 authored by Simon Arlott's avatar Simon Arlott Committed by Greg Kroah-Hartman
Browse files

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: default avatarSimon Arlott <simon@fire.lp0.eu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 5d0a9c79

drivers/usb/atm/cxacru.c

+28 −20
Original line number Diff line number Diff line
@@ -200,9 +200,12 @@ static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, \ 
static ssize_t cxacru_sysfs_show_##_name(struct device *dev, \

	struct device_attribute *attr, char *buf) \

{ \

	struct usb_interface *intf = to_usb_interface(dev); \

	struct usbatm_data *usbatm_instance = usb_get_intfdata(intf); \

	struct cxacru_data *instance = usbatm_instance->driver_data; \

	struct cxacru_data *instance = to_usbatm_driver_data(\

		to_usb_interface(dev)); \

\

	if (instance == NULL) \

		return -ENODEV; \

\

	return cxacru_sysfs_showattr_##_type(instance->card_info[_value], buf); \

} \

CXACRU__ATTR_INIT(_name)
@@ -288,22 +291,28 @@ static ssize_t cxacru_sysfs_showattr_MODU(u32 value, char *buf) 
static ssize_t cxacru_sysfs_show_mac_address(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct usb_interface *intf = to_usb_interface(dev);

	struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);

	struct atm_dev *atm_dev = usbatm_instance->atm_dev;

	struct cxacru_data *instance = to_usbatm_driver_data(

			to_usb_interface(dev));



	return snprintf(buf, PAGE_SIZE, "%pM\n", atm_dev->esi);

	if (instance == NULL || instance->usbatm->atm_dev == NULL)

		return -ENODEV;



	return snprintf(buf, PAGE_SIZE, "%pM\n",

		instance->usbatm->atm_dev->esi);

}



static ssize_t cxacru_sysfs_show_adsl_state(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct usb_interface *intf = to_usb_interface(dev);

	struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);

	struct cxacru_data *instance = usbatm_instance->driver_data;

	u32 value = instance->card_info[CXINF_LINE_STARTABLE];



	static char *str[] = { "running", "stopped" };

	struct cxacru_data *instance = to_usbatm_driver_data(

			to_usb_interface(dev));

	u32 value;



	if (instance == NULL)

		return -ENODEV;



	value = instance->card_info[CXINF_LINE_STARTABLE];

	if (unlikely(value >= ARRAY_SIZE(str)))

		return snprintf(buf, PAGE_SIZE, "%u\n", value);

	return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
@@ -312,9 +321,8 @@ static ssize_t cxacru_sysfs_show_adsl_state(struct device *dev, 
static ssize_t cxacru_sysfs_store_adsl_state(struct device *dev,

	struct device_attribute *attr, const char *buf, size_t count)

{

	struct usb_interface *intf = to_usb_interface(dev);

	struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);

	struct cxacru_data *instance = usbatm_instance->driver_data;

	struct cxacru_data *instance = to_usbatm_driver_data(

			to_usb_interface(dev));

	int ret;

	int poll = -1;

	char str_cmd[8];
@@ -328,13 +336,16 @@ static ssize_t cxacru_sysfs_store_adsl_state(struct device *dev, 
		return -EINVAL;

	ret = 0;



	if (instance == NULL)

		return -ENODEV;



	if (mutex_lock_interruptible(&instance->adsl_state_serialize))

		return -ERESTARTSYS;



	if (!strcmp(str_cmd, "stop") || !strcmp(str_cmd, "restart")) {

		ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_STOP, NULL, 0, NULL, 0);

		if (ret < 0) {

			atm_err(usbatm_instance, "change adsl state:"

			atm_err(instance->usbatm, "change adsl state:"

				" CHIP_ADSL_LINE_STOP returned %d\n", ret);



			ret = -EIO;
@@ -354,7 +365,7 @@ static ssize_t cxacru_sysfs_store_adsl_state(struct device *dev, 
	if (!strcmp(str_cmd, "start") || !strcmp(str_cmd, "restart")) {

		ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_START, NULL, 0, NULL, 0);

		if (ret < 0) {

			atm_err(usbatm_instance, "change adsl state:"

			atm_err(instance->usbatm, "change adsl state:"

				" CHIP_ADSL_LINE_START returned %d\n", ret);



			ret = -EIO;
@@ -649,9 +660,6 @@ static int cxacru_atm_start(struct usbatm_data *usbatm_instance, 
{

	struct cxacru_data *instance = usbatm_instance->driver_data;

	struct usb_interface *intf = usbatm_instance->usb_intf;

	/*

	struct atm_dev *atm_dev = usbatm_instance->atm_dev;

	*/

	int ret;

	int start_polling = 1;

drivers/usb/atm/usbatm.c

+1 −0
Original line number Diff line number Diff line
@@ -1333,6 +1333,7 @@ void usbatm_usb_disconnect(struct usb_interface *intf) 
	if (instance->atm_dev) {

		sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");

		atm_dev_deregister(instance->atm_dev);

		instance->atm_dev = NULL;

	}



	usbatm_put_instance(instance);	/* taken in usbatm_usb_probe */

drivers/usb/atm/usbatm.h

+15 −0
Original line number Diff line number Diff line
@@ -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_ */

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