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AK: Fix crash during teardown of self-owning objects
We now null out smart pointers *before* calling unref on the pointee. This ensures that the same smart pointer can't be used to acquire a new reference to the pointee after its destruction has begun. I ran into this when destroying a non-empty IntrusiveList of RefPtrs, but the problem was more general so this fixes it for all of RefPtr, NonnullRefPtr, OwnPtr and NonnullOwnPtr.
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10 changed files with 102 additions and 14 deletions
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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@ -153,3 +153,15 @@ TEST_CASE(adopt_ref_if_nonnull)
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RefPtr<SelfAwareObject> failed_allocation = adopt_ref_if_nonnull(null_object);
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EXPECT_EQ(failed_allocation.is_null(), true);
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}
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TEST_CASE(destroy_self_owning_refcounted_object)
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{
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struct SelfOwningRefCounted : public RefCounted<SelfOwningRefCounted> {
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RefPtr<SelfOwningRefCounted> self;
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};
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RefPtr object = make_ref_counted<SelfOwningRefCounted>();
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auto* object_ptr = object.ptr();
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object->self = object;
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object = nullptr;
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object_ptr->self = nullptr;
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}
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