USB: g_file_storage: fix use-after-free bug when closing files

This patch (as1231) fixes a use-after-free bug in g_file_storage. A
device's name may not be available after the device is unregistered,
even if the device structure itself is still allocated. Since
close_backing_file() prints a LUN's name for debugging, it shouldn't
be called after the LUN has been unregistered.

That whole area needed to be cleaned up; the backing files were
getting closed in a couple of different places. The patch fixes
things so that they get closed in just one place, as part of the
unbind procedure, immediately before the LUN is unregistered.

Signed-off-by: Alan Stern <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/gadget/file_storage.c

···
 static struct usb_gadget_driver		fsg_driver;
 
 static void	close_backing_file(struct lun *curlun);
-static void	close_all_backing_files(struct fsg_dev *fsg);
 
 
 /*-------------------------------------------------------------------------*/
···
 	fsg->thread_task = NULL;
 	spin_unlock_irq(&fsg->lock);
 
-	/* In case we are exiting because of a signal, unregister the
-	 * gadget driver and close the backing file. */
-	if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) {
+	/* If we are exiting because of a signal, unregister the
+	 * gadget driver. */
+	if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags))
 		usb_gadget_unregister_driver(&fsg_driver);
-		close_all_backing_files(fsg);
-	}
 
 	/* Let the unbind and cleanup routines know the thread has exited */
 	complete_and_exit(&fsg->thread_notifier, 0);
···
 		fput(curlun->filp);
 		curlun->filp = NULL;
 	}
-}
-
-static void close_all_backing_files(struct fsg_dev *fsg)
-{
-	int	i;
-
-	for (i = 0; i < fsg->nluns; ++i)
-		close_backing_file(&fsg->luns[i]);
 }
 
 
···
 		if (curlun->registered) {
 			device_remove_file(&curlun->dev, &dev_attr_ro);
 			device_remove_file(&curlun->dev, &dev_attr_file);
+			close_backing_file(curlun);
 			device_unregister(&curlun->dev);
 			curlun->registered = 0;
 		}
···
 out:
 	fsg->state = FSG_STATE_TERMINATED;	// The thread is dead
 	fsg_unbind(gadget);
-	close_all_backing_files(fsg);
 	complete(&fsg->thread_notifier);
 	return rc;
 }
···
 	/* Wait for the thread to finish up */
 	wait_for_completion(&fsg->thread_notifier);
 
-	close_all_backing_files(fsg);
 	kref_put(&fsg->ref, fsg_release);
 }
 module_exit(fsg_cleanup);