staging: comedi: bug-fix NULL pointer dereference on failed attach
authorIan Abbott <abbotti@mev.co.uk>
Fri, 23 Aug 2013 11:37:17 +0000 (12:37 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 23 Aug 2013 17:31:47 +0000 (10:31 -0700)
Commit dcd7b8bd63cb81c5b973bf86510ca3c80bbbd162 ("staging: comedi: put
module _after_ detach" by myself) reversed a couple of calls in
`comedi_device_attach()` when recovering from an error returned by the
low-level driver's 'attach' handler.  Unfortunately, that introduced a
NULL pointer dereference bug as `dev->driver` is NULL after the call to
`comedi_device_detach()`.   We still have a pointer to the low-level
comedi driver structure in the `driv` variable, so use that instead.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/comedi/drivers.c

index e25eba5..b3b5125 100644 (file)
@@ -482,7 +482,7 @@ int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it)
                ret = comedi_device_postconfig(dev);
        if (ret < 0) {
                comedi_device_detach(dev);
-               module_put(dev->driver->module);
+               module_put(driv->module);
        }
        /* On success, the driver module count has been incremented. */
        return ret;