drm/i915: Fix use after free in logical_render_ring_init
authorTvrtko Ursulin <tvrtko.ursulin@intel.com>
Fri, 16 Dec 2016 13:18:42 +0000 (13:18 +0000)
committerTvrtko Ursulin <tvrtko.ursulin@intel.com>
Fri, 16 Dec 2016 14:30:00 +0000 (14:30 +0000)
Commit 3b3f1650b1ca ("drm/i915: Allocate intel_engine_cs
structure only for the enabled engines") introduced the
dynanically allocated engine instances and created an
potential use after free scenario in logical_render_ring_init
where lrc_destroy_wa_ctx_obj could be called after the engine
instance has been freed.

This can only happen during engine setup/init error handling
which luckily does not happen ever in practice.

Fix is to not call lrc_destroy_wa_ctx_obj since it would have
already been executed from the preceding engine cleanup.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 3b3f1650b1ca ("drm/i915: Allocate intel_engine_cs structure only for the enabled engines")
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1481894322-2145-1-git-send-email-tvrtko.ursulin@linux.intel.com
drivers/gpu/drm/i915/intel_lrc.c

index 8b41288..877aded 100644 (file)
@@ -1965,12 +1965,7 @@ int logical_render_ring_init(struct intel_engine_cs *engine)
                          ret);
        }
 
-       ret = logical_ring_init(engine);
-       if (ret) {
-               lrc_destroy_wa_ctx_obj(engine);
-       }
-
-       return ret;
+       return logical_ring_init(engine);
 }
 
 int logical_xcs_ring_init(struct intel_engine_cs *engine)