From 4a98780baa2d58c54f1ec593f8f34e3d1d6d6a9f Mon Sep 17 00:00:00 2001
From: Murray McAllister <murray.mcallister@insomniasec.com>
Date: Mon, 27 Mar 2017 11:15:12 +0200
Subject: [PATCH] drm/vmwgfx: avoid calling vzalloc with a 0 size in
 vmw_get_cap_3d_ioctl()

commit 63774069d9527a1aeaa4aa20e929ef5e8e9ecc38 upstream.

In vmw_get_cap_3d_ioctl(), a user can supply 0 for a size that is
used in vzalloc(). This eventually calls dump_stack() (in warn_alloc()),
which can leak useful addresses to dmesg.

Add check to avoid a size of 0.

Signed-off-by: Murray McAllister <murray.mcallister@insomniasec.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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