Commit f5869a83 authored by Alan Cox's avatar Alan Cox Committed by Dave Airlie
Browse files

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: default avatarAlan Cox <alan@linux.intel.com>
Reviewed-by: default avatarJakob Bornecrantz <jakob@vmware.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 85119c16
......@@ -1688,15 +1688,19 @@ int vmw_du_page_flip(struct drm_crtc *crtc,
struct vmw_private *dev_priv = vmw_priv(crtc->dev);
struct drm_framebuffer *old_fb = crtc->fb;
struct vmw_framebuffer *vfb = vmw_framebuffer_to_vfb(fb);
struct drm_file *file_priv = event->base.file_priv;
struct drm_file *file_priv ;
struct vmw_fence_obj *fence = NULL;
struct drm_clip_rect clips;
int ret;
if (event == NULL)
return -EINVAL;
/* require ScreenObject support for page flipping */
if (!dev_priv->sou_priv)
return -ENOSYS;
file_priv = event->base.file_priv;
if (!vmw_kms_screen_object_flippable(dev_priv, crtc))
return -EINVAL;
......
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