From: Zhaowei Yuan <zhaowei.yuan@samsung.com>
Date: Wed, 18 Jun 2014 06:33:59 +0000 (+0800)
Subject: drm: fix NULL pointer access by wrong ioctl
X-Git-Tag: v3.2.61~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c1ec4bfa383ddf85459a3c299db27377ac537d0;p=pandora-kernel.git

drm: fix NULL pointer access by wrong ioctl

commit 1539fb9bd405ee32282ea0a38404f9e008ac5b7a upstream.

If user uses wrong ioctl command with _IOC_NONE and argument size
greater than 0, it can cause NULL pointer access from memset of line
463. If _IOC_NONE, don't memset to 0 for kdata.

Signed-off-by: Zhaowei Yuan <zhaowei.yuan@samsung.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
[bwh: Backported to 3.2: adjust indentation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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