USB: Close usb_find_interface race v3

USB drivers that create character devices call usb_register_dev in their
probe function. This associates the usb_interface device with that minor
number and creates the character device and announces it to the world.
However, the driver's probe function is called before the new
usb_interface is added to the driver's klist_devices.

This is a problem because userspace will respond to the character device
creation announcement by opening the character device. The driver's open
function will the call usb_find_interface to find the usb_interface
associated with that minor number. usb_find_interface will walk the
driver's list of devices and find the usb_interface with the matching
minor number.

Because the announcement happens before the usb_interface is added to the
driver's klist_devices, a race condition exists. A straightforward fix
is to walk the list of devices on usb_bus_type instead since the device
is added to that list before the announcement occurs.

bus_find_device calls get_device to bump the reference count on the found
device. It is arguable that the reference count should be dropped by the
caller of usb_find_interface instead of usb_find_interface, however,
the current users of usb_find_interface do not expect this.

The original version of this patch only matched against minor number
instead of driver and minor number. This version matches against both.

Signed-off-by: Russ Dill <Russ.Dill@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 16 insertions, 15 deletions

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 932f68e6ad19..d86276c639c1 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -169,7 +169,7 @@ EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting);
 
 struct find_interface_arg {
         int minor;
-        struct usb_interface *interface;
+        struct device_driver *drv;
 };
 
 static int __find_interface(struct device *dev, void *data)
@@ -180,12 +180,10 @@ static int __find_interface(struct device *dev, void *data)
         if (!is_usb_interface(dev))
                 return 0;
 
+        if (dev->driver != arg->drv)
+                return 0;
         intf = to_usb_interface(dev);
-        if (intf->minor != -1 && intf->minor == arg->minor) {
-                arg->interface = intf;
-                return 1;
-        }
-        return 0;
+        return intf->minor == arg->minor;
 }
 
 /**
@@ -193,21 +191,24 @@ static int __find_interface(struct device *dev, void *data)
  * @drv: the driver whose current configuration is considered
  * @minor: the minor number of the desired device
  *
- * This walks the driver device list and returns a pointer to the interface
- * with the matching minor.  Note, this only works for devices that share the
- * USB major number.
+ * This walks the bus device list and returns a pointer to the interface
+ * with the matching minor and driver.  Note, this only works for devices
+ * that share the USB major number.
  */
 struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor)
 {
         struct find_interface_arg argb;
-        int retval;
+        struct device *dev;
 
         argb.minor = minor;
-        argb.interface = NULL;
-        /* eat the error, it will be in argb.interface */
-        retval = driver_for_each_device(&drv->drvwrap.driver, NULL, &argb,
-                                        __find_interface);
-        return argb.interface;
+        argb.drv = &drv->drvwrap.driver;
+
+        dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface);
+
+        /* Drop reference count from bus_find_device */
+        put_device(dev);
+
+        return dev ? to_usb_interface(dev) : NULL;
 }
 EXPORT_SYMBOL_GPL(usb_find_interface);