diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2013-08-20 11:50:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-20 07:34:21 -0800 |
| commit | 70a9deaa57ee1572c95dce7ec1991bf018728f3a (patch) | |
| tree | 5669b2acfc49a092d39eb154fb7e2ac53ed43911 | |
| parent | e71859894bfd0ceaf65e98bf287478242d17a9ec (diff) | |
staging: comedi: pcmuio: fix possible NULL deref on detach
commit 2fd2bdfccae61efe18f6b92b6a45fbf936d75b48 upstream.
pcmuio_detach() is called by the comedi core even if pcmuio_attach()
returned an error, so `dev->private` might be `NULL`. Check for that
before dereferencing it.
Also, as pointed out by Dan Carpenter, there is no need to check the
pointer passed to `kfree()` is non-NULL, so remove that check.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/comedi/drivers/pcmuio.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/staging/comedi/drivers/pcmuio.c b/drivers/staging/comedi/drivers/pcmuio.c index 661ba2e0389..6e936c54f11 100644 --- a/drivers/staging/comedi/drivers/pcmuio.c +++ b/drivers/staging/comedi/drivers/pcmuio.c @@ -464,13 +464,13 @@ static int pcmuio_detach(struct comedi_device *dev) if (dev->iobase) release_region(dev->iobase, ASIC_IOSIZE * thisboard->num_asics); - for (i = 0; i < MAX_ASICS; ++i) { - if (devpriv->asics[i].irq) - free_irq(devpriv->asics[i].irq, dev); - } - - if (devpriv && devpriv->sprivs) + if (devpriv) { + for (i = 0; i < MAX_ASICS; ++i) { + if (devpriv->asics[i].irq) + free_irq(devpriv->asics[i].irq, dev); + } kfree(devpriv->sprivs); + } return 0; } |