drm/radeon: r100/r200 ums: block ability for userspace app to trash 0 page and beyond

[net-next-2.6.git] / drivers / gpu / drm / radeon / radeon_state.c

diff --git a/drivers/gpu/drm/radeon/radeon_state.c b/drivers/gpu/drm/radeon/radeon_state.c
index 44b6d66b0ab31a6d67a4c3bd5a5ed44a50767529..8e69dc485dcb9bb106db6fe990e1803b7ebd020c 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_state.c
+++ b/drivers/gpu/drm/radeon/radeon_state.c
@@ -105,6 +105,7 @@ static __inline__ int radeon_check_and_fixup_packets(drm_radeon_private_t *
                        DRM_ERROR("Invalid depth buffer offset\n");
                        return -EINVAL;
                }
+               dev_priv->have_z_offset = 1;
                break;
 
        case RADEON_EMIT_PP_CNTL:
@@ -898,6 +899,11 @@ static void radeon_cp_dispatch_clear(struct drm_device * dev,
                if (tmp & RADEON_BACK)
                        flags |= RADEON_FRONT;
        }
+       if (flags & (RADEON_DEPTH|RADEON_STENCIL)) {
+               if (!dev_priv->have_z_offset)
+                       printk_once(KERN_ERR "radeon: illegal depth clear request. Buggy mesa detected - please update.\n");
+               flags &= ~(RADEON_DEPTH | RADEON_STENCIL);
+       }
 
        if (flags & (RADEON_FRONT | RADEON_BACK)) {