1 files changed, 15 insertions, 5 deletions

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 39be673..40b40ed 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -136,6 +136,11 @@ static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
 	/* Device config is special, because it must work on
 	 * an unconfigured device. */
 	if (cmd == COMEDI_DEVCONFIG) {
+		if (minor >= COMEDI_NUM_BOARD_MINORS) {
+			/* Device config not appropriate on non-board minors. */
+			rc = -ENOTTY;
+			goto done;
+		}
 		rc = do_devconfig_ioctl(dev,
 					(struct comedi_devconfig __user *)arg);
 		if (rc == 0)
@@ -1365,6 +1370,7 @@ static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
 			   void *file)
 {
 	struct comedi_subdevice *s;
+	int ret;
 
 	if (arg >= dev->n_subdevices)
 		return -EINVAL;
@@ -1381,7 +1387,11 @@ static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
 	if (s->busy != file)
 		return -EBUSY;
 
-	return do_cancel(dev, s);
+	ret = do_cancel(dev, s);
+	if (comedi_get_subdevice_runflags(s) & SRF_USER)
+		wake_up_interruptible(&s->async->wait_head);
+
+	return ret;
 }
 
 /*
@@ -1572,7 +1582,7 @@ static unsigned int comedi_poll(struct file *file, poll_table * wait)
 
 	mask = 0;
 	read_subdev = comedi_get_read_subdevice(dev_file_info);
-	if (read_subdev) {
+	if (read_subdev && read_subdev->async) {
 		poll_wait(file, &read_subdev->async->wait_head, wait);
 		if (!read_subdev->busy
 		    || comedi_buf_read_n_available(read_subdev->async) > 0
@@ -1582,7 +1592,7 @@ static unsigned int comedi_poll(struct file *file, poll_table * wait)
 		}
 	}
 	write_subdev = comedi_get_write_subdevice(dev_file_info);
-	if (write_subdev) {
+	if (write_subdev && write_subdev->async) {
 		poll_wait(file, &write_subdev->async->wait_head, wait);
 		comedi_buf_write_alloc(write_subdev->async,
 				       write_subdev->async->prealloc_bufsz);
@@ -1624,7 +1634,7 @@ static ssize_t comedi_write(struct file *file, const char __user *buf,
 	}
 
 	s = comedi_get_write_subdevice(dev_file_info);
-	if (s == NULL) {
+	if (s == NULL || s->async == NULL) {
 		retval = -EIO;
 		goto done;
 	}
@@ -1735,7 +1745,7 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
 	}
 
 	s = comedi_get_read_subdevice(dev_file_info);
-	if (s == NULL) {
+	if (s == NULL || s->async == NULL) {
 		retval = -EIO;
 		goto done;
 	}