From 20996e6d81c907b10a5ab57c4172be97cb1a7de1 Mon Sep 17 00:00:00 2001
From: Murray McAllister <murray.mcallister@insomniasec.com>
Date: Mon, 27 Mar 2017 11:12:53 +0200
Subject: [PATCH] drm/vmwgfx: NULL pointer dereference in
 vmw_surface_define_ioctl()

commit 36274ab8c596f1240c606bb514da329add2a1bcd upstream.

Before memory allocations vmw_surface_define_ioctl() checks the
upper-bounds of a user-supplied size, but does not check if the
supplied size is 0.

Add check to avoid NULL pointer dereferences.

Signed-off-by: Murray McAllister <murray.mcallister@insomniasec.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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