From: Ian Abbott <abbotti@mev.co.uk>
Date: Tue, 20 Aug 2013 10:50:19 +0000 (+0100)
Subject: staging: comedi: pcmuio: fix possible NULL deref on detach
X-Git-Tag: v3.12-rc1~183^2~186
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2fd2bdfccae61efe18f6b92b6a45fbf936d75b48;p=pandora-kernel.git

staging: comedi: pcmuio: fix possible NULL deref on detach

pcmuio_detach() is called by the comedi core even if pcmuio_attach()
returned an error, so `dev->private` might be `NULL`.  Check for that
before dereferencing it.

Also, as pointed out by Dan Carpenter, there is no need to check the
pointer passed to `kfree()` is non-NULL, so remove that check.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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