This is a note to let you know that I've just added the patch titled
staging: comedi: 8255_pci: fix possible NULL deref during detach
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From f4dd2367f3ad276fe49c89a522267ea5ccb6bf80 Mon Sep 17 00:00:00 2001
From: Ian Abbott <[email protected]>
Date: Wed, 3 Oct 2012 16:25:15 +0100
Subject: 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: <[email protected]> # 3.6.x
Signed-off-by: Ian Abbott <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/staging/comedi/drivers/8255_pci.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/staging/comedi/drivers/8255_pci.c
b/drivers/staging/comedi/drivers/8255_pci.c
index 7dff3c0..d00aff6 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];
--
1.7.12.2.421.g261b511
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