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https://github.com/Evolution-X/hardware_interfaces
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70197263f0
If LinkedCallback::Make returns nullptr, do not put it in Health::callback_. Otherwise, OnHealthInfoChanged crashes later because the linked callback objects are not null checked before accessing. Test: android.hardware.health-service.aidl_fuzzer (with a special corpus) Fixes: 289599278 Change-Id: I8bad41dbcfbefeb54744059baffd4eef1ae7ec42
62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <memory>
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#include <aidl/android/hardware/health/IHealthInfoCallback.h>
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#include <android-base/macros.h>
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#include <android-base/result.h>
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#include <android/binder_auto_utils.h>
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#include <health-impl/Health.h>
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namespace aidl::android::hardware::health {
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// Type of the cookie pointer in linkToDeath.
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// A (Health, IHealthInfoCallback) tuple.
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class LinkedCallback {
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public:
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// Automatically linkToDeath upon construction with the returned object as the cookie.
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// service->death_reciepient() should be from CreateDeathRecipient().
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// Not using a strong reference to |service| to avoid circular reference. The lifetime
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// of |service| must be longer than this LinkedCallback object.
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static ::android::base::Result<std::unique_ptr<LinkedCallback>> Make(
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std::shared_ptr<Health> service, std::shared_ptr<IHealthInfoCallback> callback);
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// Automatically unlinkToDeath upon destruction. So, it is always safe to reinterpret_cast
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// the cookie back to the LinkedCallback object.
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~LinkedCallback();
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// The wrapped IHealthInfoCallback object.
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const std::shared_ptr<IHealthInfoCallback>& callback() const { return callback_; }
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// On callback died, unreigster it from the service.
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void OnCallbackDied();
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private:
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LinkedCallback();
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DISALLOW_COPY_AND_ASSIGN(LinkedCallback);
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std::shared_ptr<Health> service();
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std::weak_ptr<Health> service_;
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std::shared_ptr<IHealthInfoCallback> callback_;
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};
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} // namespace aidl::android::hardware::health
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