staging: comedi: disallow COMEDI_DEVCONFIG on non-board minors

[pandora-kernel.git] / drivers / staging / comedi / comedi_fops.c

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index ab9f5ed..13e79a1 100644 (file)
--- 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);
                goto done;