3.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ian Abbott <abbo...@mev.co.uk>
commit 1d1171ffda585c1cab7bd7cf4bd8f8fd5923fb4a upstream.
`pc263_detach()` is called by the comedi core to clean up if either
`pc263_attach()` or `pc263_attach_pci()` returns an error. It sets
`thisboard` to the return value of `comedi_board(dev)` and assumes it is
non-null. This is a valid assumption if `pc263_attach()` fails, but not
if `pc263_attach_pci()` fails, leading to a possible NULL pointer
dereference.
Check `thisboard` at the top of `pc263_detach()` and return early if it
is `NULL`. This is okay because no other resources need cleaning up in
this case.
Signed-off-by: Ian Abbott <abbo...@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/amplc_pc263.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/staging/comedi/drivers/amplc_pc263.c
+++ b/drivers/staging/comedi/drivers/amplc_pc263.c
@@ -310,8 +310,11 @@ static int __devinit pc263_attach_pci(st
static void pc263_detach(struct comedi_device *dev)
{
+ const struct pc263_board *thisboard = comedi_board(dev);
struct pci_dev *pcidev = comedi_to_pci_dev(dev);
+ if (!thisboard)
+ return;
if (pcidev) {
if (dev->iobase)
comedi_pci_disable(pcidev);
--
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