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Fix crash when saving resources with circular references

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When saving resources, marking of already seen resources was
done too late, causing infinite loop traversing referenced resources
and eventual stack overflow. The change marks traversed resource
before descending to it's children, thus when this resource is
encountered again, it is already marked as seen and traversal stops.
This commit is contained in:
Maxim Kulkin 2023-02-17 05:18:58 -05:00 committed by Yuri Sizov
parent 0f7625ab46
commit 058604f5b8
3 changed files with 57 additions and 3 deletions
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3
core/io/resource_format_binary.cpp
View file

@ -1960,6 +1960,8 @@ void ResourceFormatSaverBinaryInstance::_find_resources(const Variant &p_variant
return;
}
resource_set.insert(res);
List<PropertyInfo> property_list;
res->get_property_list(&property_list);
@ -1983,7 +1985,6 @@ void ResourceFormatSaverBinaryInstance::_find_resources(const Variant &p_variant
}
}
resource_set.insert(res);
saved_resources.push_back(res);
} break;

5
scene/resources/resource_format_text.cpp
View file

@ -1877,6 +1877,8 @@ void ResourceFormatSaverTextInstance::_find_resources(const Variant &p_variant,
return;
}
resource_set.insert(res);
List<PropertyInfo> property_list;
res->get_property_list(&property_list);
@ -1908,8 +1910,7 @@ void ResourceFormatSaverTextInstance::_find_resources(const Variant &p_variant,
I = I->next();
}
resource_set.insert(res); //saved after, so the children it needs are available when loaded
saved_resources.push_back(res);
saved_resources.push_back(res); // Saved after, so the children it needs are available when loaded
} break;
case Variant::ARRAY: {

52
tests/core/io/test_resource.h
View file

@ -109,6 +109,58 @@ TEST_CASE("[Resource] Saving and loading") {
loaded_child_resource_text->get_name() == "I'm a child resource",
"The loaded child resource name should be equal to the expected value.");
}
TEST_CASE("[Resource] Breaking circular references on save") {
Ref<Resource> resource_a = memnew(Resource);
resource_a->set_name("A");
Ref<Resource> resource_b = memnew(Resource);
resource_b->set_name("B");
Ref<Resource> resource_c = memnew(Resource);
resource_c->set_name("C");
resource_a->set_meta("next", resource_b);
resource_b->set_meta("next", resource_c);
resource_c->set_meta("next", resource_b);
const String save_path_binary = OS::get_singleton()->get_cache_path().path_join("resource.res");
const String save_path_text = OS::get_singleton()->get_cache_path().path_join("resource.tres");
ResourceSaver::save(resource_a, save_path_binary);
ResourceSaver::save(resource_a, save_path_text);
const Ref<Resource> &loaded_resource_a_binary = ResourceLoader::load(save_path_binary);
CHECK_MESSAGE(
loaded_resource_a_binary->get_name() == "A",
"The loaded resource name should be equal to the expected value.");
const Ref<Resource> &loaded_resource_b_binary = loaded_resource_a_binary->get_meta("next");
CHECK_MESSAGE(
loaded_resource_b_binary->get_name() == "B",
"The loaded child resource name should be equal to the expected value.");
const Ref<Resource> &loaded_resource_c_binary = loaded_resource_b_binary->get_meta("next");
CHECK_MESSAGE(
loaded_resource_c_binary->get_name() == "C",
"The loaded child resource name should be equal to the expected value.");
CHECK_MESSAGE(
!loaded_resource_c_binary->get_meta("next"),
"The loaded child resource circular reference should be NULL.");
const Ref<Resource> &loaded_resource_a_text = ResourceLoader::load(save_path_text);
CHECK_MESSAGE(
loaded_resource_a_text->get_name() == "A",
"The loaded resource name should be equal to the expected value.");
const Ref<Resource> &loaded_resource_b_text = loaded_resource_a_text->get_meta("next");
CHECK_MESSAGE(
loaded_resource_b_text->get_name() == "B",
"The loaded child resource name should be equal to the expected value.");
const Ref<Resource> &loaded_resource_c_text = loaded_resource_b_text->get_meta("next");
CHECK_MESSAGE(
loaded_resource_c_text->get_name() == "C",
"The loaded child resource name should be equal to the expected value.");
CHECK_MESSAGE(
!loaded_resource_c_text->get_meta("next"),
"The loaded child resource circular reference should be NULL.");
// Break circular reference to avoid memory leak
resource_c->remove_meta("next");
}
} // namespace TestResource
#endif // TEST_RESOURCE_H