Commit 3955dfa8 authored by Ian Abbott's avatar Ian Abbott Committed by Greg Kroah-Hartman

staging: comedi: bug-fix NULL pointer dereference on failed attach

Commit dcd7b8bd ("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: default avatarIan Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 06cdff8a
......@@ -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;
......
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