drm/i915/gt: Empty uabi engines list during intel_engines_release()

While the uabi_engines_llist is populated in intel_engines_init() during
driver load, the corresponding function intel_engines_release() does not
correctly get rid of it. This can lead to a UAF if, after failed
initialization (for example when gt is set wedged on init), we try to
access the engines.

Suggested-by: Chris Wilson <[email protected]>
Signed-off-by: Krzysztof Niemiec <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: k-niemiec

drivers/gpu/drm/i915/gt/intel_engine_cs.c

@@ -693,6 +693,8 @@ void intel_engines_release(struct intel_gt *gt)
 
 		memset(&engine->reset, 0, sizeof(engine->reset));
 	}
+
+	llist_del_all(&gt->i915->uabi_engines_llist);
 }
 
 void intel_engine_free_request_pool(struct intel_engine_cs *engine)