drm: Release driver tracking before making the object available again
authorChris Wilson <chris@chris-wilson.co.uk>
Sat, 19 Aug 2017 12:05:58 +0000 (13:05 +0100)
committerJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Tue, 22 Aug 2017 13:03:43 +0000 (16:03 +0300)
This is the same bug as we fixed in commit f6cd7daecff5 ("drm: Release
driver references to handle before making it available again"), but now
the exposure is via the PRIME lookup tables. If we remove the
object/handle from the PRIME lut, then a new request for the same
object/fd will generate a new handle, thus for a short window that
object is known to userspace by two different handles. Fix this by
releasing the driver tracking before PRIME.

Fixes: 0ff926c7d4f0 ("drm/prime: add exported buffers to current fprivs
imported buffer list (v2)")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Thierry Reding <treding@nvidia.com>
Cc: stable@vger.kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170819120558.6465-1-chris@chris-wilson.co.uk
drivers/gpu/drm/drm_gem.c

index 8dc11064253d9e5ed58f8c817a471b36c25c5951..cdaac37907b1e4577565625f6485a7cf3de25088 100644 (file)
@@ -255,13 +255,13 @@ drm_gem_object_release_handle(int id, void *ptr, void *data)
        struct drm_gem_object *obj = ptr;
        struct drm_device *dev = obj->dev;
 
+       if (dev->driver->gem_close_object)
+               dev->driver->gem_close_object(obj, file_priv);
+
        if (drm_core_check_feature(dev, DRIVER_PRIME))
                drm_gem_remove_prime_handles(obj, file_priv);
        drm_vma_node_revoke(&obj->vma_node, file_priv);
 
-       if (dev->driver->gem_close_object)
-               dev->driver->gem_close_object(obj, file_priv);
-
        drm_gem_object_handle_put_unlocked(obj);
 
        return 0;