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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>
This commit is contained in:
Ian Abbott 2012-10-03 16:25:15 +01:00 committed by Greg Kroah-Hartman
parent 6681e63399
commit f4dd2367f3
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/comedi/drivers/8255_pci.c
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@ -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];