[PATCH 20/20] staging: comedi: adv_pci_dio: fix bug in 'detach'

[H Hartley Sweeten]

The 'attach' function can fail between when the devpriv and
the comedi subdevices are allocated. If it does the 'detach'
will try to access unallocated memory when it goes thru the
subdevices.

Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/staging/comedi/drivers/adv_pci_dio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/comedi/drivers/adv_pci_dio.c b/drivers/staging/comedi/drivers/adv_pci_dio.c
index 4da0e7b..a4c1b13 100644
--- a/drivers/staging/comedi/drivers/adv_pci_dio.c
+++ b/drivers/staging/comedi/drivers/adv_pci_dio.c
@@ -1184,6 +1184,8 @@ static void pci_dio_detach(struct comedi_device *dev)
 	if (devpriv) {
 		if (devpriv->valid)
 			pci_dio_reset(dev);
+	}
+	if (dev->subdevices) {
 		for (i = 0; i < dev->n_subdevices; i++) {
 			s = dev->subdevices + i;
 			if (s->type == COMEDI_SUBD_DIO)
-- 
1.7.11

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