From 1539fb9bd405ee32282ea0a38404f9e008ac5b7a Mon Sep 17 00:00:00 2001
From: Zhaowei Yuan <zhaowei.yuan@samsung.com>
Date: Wed, 18 Jun 2014 14:33:59 +0800
Subject: [PATCH] drm: fix NULL pointer access by wrong ioctl

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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---
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