staging: comedi: 8255_pci: fix possible NULL deref during detach

`pci_8255_detach()` will be called by the comedi core if
`pci_8255_attach_pci()` returns an error.  It currently assumes that
both `board` (assigned from the return value of `comedi_board(dev)`) and
`devpriv` (assigned from `dev->private`) are non-null, but they might
be null, leading to a null pointer dereference.

`pci_8255_detach()` doesn't need to do anything if either `board` or
`devpriv` are null, so just return early in this case.

Cc: <stable@vger.kernel.org> # 3.6.x
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/8255_pci.c b/drivers/staging/comedi/drivers/8255_pci.c
index 7dff3c0..d00aff6 100644 (file)
--- a/drivers/staging/comedi/drivers/8255_pci.c
+++ b/drivers/staging/comedi/drivers/8255_pci.c
@@ -289,6 +289,8 @@ static void pci_8255_detach(struct comedi_device *dev)
        struct comedi_subdevice *s;
        int i;
 
+       if (!board || !devpriv)
+               return;
        if (dev->subdevices) {
                for (i = 0; i < board->n_8255; i++) {
                        s = &dev->subdevices[i];