drm: stop vmgfx driver explosion
authorAlan Cox <alan@linux.intel.com>
Mon, 20 Aug 2012 14:44:52 +0000 (14:44 +0000)
committerDave Airlie <airlied@redhat.com>
Tue, 21 Aug 2012 23:26:50 +0000 (09:26 +1000)
commitf5869a8308f77e3dfdc2e3640842b285aa788ff8
tree5595d976c072e81bbd6dda20131841511b5ad79f
parent85119c16b34526b2b3c33b01ac6d770aa4431434
drm: stop vmgfx driver explosion

If you do a page flip with no flags set then event is NULL. If event is
NULL then the vmw_gfx driver likes to go digging into NULL and extracts
NULL->base.file_priv.

On a modern kernel with NULL mapping protection it's just another oops,
without it there are some "intriguing" possibilities.

What it should do is an open question but that for the driver owners to
sort out.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c