From: Ian Abbott <abbotti@mev.co.uk>
Date: Wed, 3 Oct 2012 15:25:15 +0000 (+0100)
Subject: staging: comedi: 8255_pci: fix possible NULL deref during detach
X-Git-Tag: v3.7-rc3~13^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4dd2367f3ad276fe49c89a522267ea5ccb6bf80;p=pandora-kernel.git

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: <stable@vger.kernel.org> # 3.6.x
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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