diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2013-08-23 12:37:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-23 10:31:47 -0700 |
| commit | 3955dfa8216f712bc204a5ad2f4e51efff252fde (patch) | |
| tree | fd4e91763cbf0063028bcc1ec2d2ea5f94437419 | |
| parent | 06cdff8a593bc52d53ce5c4c5cfc961a7fc32ad3 (diff) | |
staging: comedi: bug-fix NULL pointer dereference on failed attach
Commit dcd7b8bd63cb81c5b973bf86510ca3c80bbbd162 ("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: Ian Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/comedi/drivers.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c index e25eba5713c1..b3b5125faa72 100644 --- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -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; |