drm/lease: Make sure implicit planes are leased

If userspace doesn't enable universal planes, then we automatically
add the primary and cursor planes. But for universal userspace there's
no such check (and maybe we only want to give the lessee one plane,
maybe not even the primary one), hence we need to check for the
implied plane.

v2: don't forget setcrtc ioctl.

v3: Still allow disabling of the crtc in SETCRTC.

Cc: stable@vger.kernel.org
Cc: Keith Packard <keithp@keithp.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190228144910.26488-6-daniel.vetter@ffwll.ch

2 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 7dabbaf033a1..790ba5941954 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -559,6 +559,10 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 
         plane = crtc->primary;
 
+        /* allow disabling with the primary plane leased */
+        if (crtc_req->mode_valid && !drm_lease_held(file_priv, plane->base.id))
+                return -EACCES;
+
         mutex_lock(&crtc->dev->mode_config.mutex);
         DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx,
                                    DRM_MODESET_ACQUIRE_INTERRUPTIBLE, ret);
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 4cfb56893b7f..d6ad60ab0d38 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -960,6 +960,11 @@ retry:
                 if (ret)
                         goto out;
 
+                if (!drm_lease_held(file_priv, crtc->cursor->base.id)) {
+                        ret = -EACCES;
+                        goto out;
+                }
+
                 ret = drm_mode_cursor_universal(crtc, req, file_priv, &ctx);
                 goto out;
         }
@@ -1062,6 +1067,9 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 
         plane = crtc->primary;
 
+        if (!drm_lease_held(file_priv, plane->base.id))
+                return -EACCES;
+
         if (crtc->funcs->page_flip_target) {
                 u32 current_vblank;
                 int r;