diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2012-10-03 16:25:15 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-22 11:46:34 -0700 |
| commit | f4dd2367f3ad276fe49c89a522267ea5ccb6bf80 (patch) | |
| tree | 81a52677385fddf1f0a4d44269efcd39ce262c16 /drivers/staging | |
| parent | 6681e63399926651cc29bcb9d92229b6f1cf1daa (diff) | |
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>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/comedi/drivers/8255_pci.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/8255_pci.c b/drivers/staging/comedi/drivers/8255_pci.c index 7dff3c01dc2..d00aff6671d 100644 --- 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]; |