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Message-Id: <20121029213243.341990180@linuxfoundation.org>
Date: Mon, 29 Oct 2012 14:34:41 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
alan@...rguk.ukuu.org.uk, Ian Abbott <abbotti@....co.uk>
Subject: [ 028/101] staging: comedi: das08: fix possible NULL deref during detach
3.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ian Abbott <abbotti@....co.uk>
commit ee280d134f2e05e0172369a53fbe202dbfc527fa upstream.
`das08_detach()` is called by the comedi core to clean up if either
`das08_attach()` or `das08_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 `das08_attach()` fails, but not
if `das08_attach_pci()` fails, leading to a possible NULL pointer
dereference.
Check `thisboard` at the top of `das08_detach()` and return early if it
is `NULL`. This is okay because the only other thing that could have
been allocated is `dev->private` and that is freed by the comedi core,
not by this function.
Signed-off-by: Ian Abbott <abbotti@....co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/staging/comedi/drivers/das08.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -1028,6 +1028,8 @@ static void __maybe_unused das08_detach(
const struct das08_board_struct *thisboard = comedi_board(dev);
struct das08_private_struct *devpriv = dev->private;
+ if (!thisboard)
+ return;
das08_common_detach(dev);
if (IS_ENABLED(CONFIG_COMEDI_DAS08_ISA) &&
(thisboard->bustype == isa || thisboard->bustype == pc104)) {
--
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