fix: add null check for m_defSinkInter in sound applet

[mhduiy]

Added null pointer check for m_defSinkInter before accessing its properties in removeDisabledDevice method. This prevents potential segmentation faults when the default sink interface is not properly initialized or has been destroyed.

Influence:

1. Test removing disabled audio devices when m_defSinkInter is null
2. Verify sound applet stability during device hot-plug operations
3. Test audio device switching scenarios with multiple sound cards
4. Verify no crashes occur when disabling audio devices

fix: 在声音小程序中添加对 m_defSinkInter 的空指针检查

在 removeDisabledDevice 方法中访问 m_defSinkInter 属性前添加了空指针检 查。这可以防止当默认接收器接口未正确初始化或已被销毁时可能发生的段错误。

Influence:

1. 测试当 m_defSinkInter 为空时移除禁用的音频设备
2. 验证在设备热插拔操作期间声音小程序的稳定性
3. 测试多声卡场景下的音频设备切换
4. 验证禁用音频设备时不会发生崩溃

PMS: BUG-347845

Summary by Sourcery

Bug Fixes:

• Prevent potential crashes in the sound applet by adding a null check before accessing the default sink interface when removing a disabled device.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a null check for the default sink interface in the sound applet’s removeDisabledDevice logic to prevent crashes when the default sink is unavailable.

Sequence diagram for updated removeDisabledDevice null-safe behavior

sequenceDiagram
    participant SoundApplet
    participant SoundCardPort
    participant DefSinkInter

    SoundApplet->>SoundCardPort: compositeKey(cardId, portName)
    SoundApplet->>SoundApplet: removePort(compositeKey)
    alt m_defSinkInter is not null
        SoundApplet->>DefSinkInter: activePort()
        DefSinkInter-->>SoundApplet: Port
        SoundApplet->>DefSinkInter: card()
        DefSinkInter-->>SoundApplet: cardId
        alt activePort.name equals portName and card equals cardId
            SoundApplet->>SoundApplet: enableDevice(false)
        else port or card does not match
            SoundApplet->>SoundApplet: do_nothing
        end
    else m_defSinkInter is null
        SoundApplet->>SoundApplet: skip_default_sink_check
    end

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Updated class diagram for SoundApplet removeDisabledDevice logic

classDiagram
    class SoundApplet {
        - DefSinkInter m_defSinkInter
        + enableDevice(flag bool) void
        + removeDisabledDevice(portName QString, cardId unsigned_int) void
        - removePort(compositeKey QString) void
    }

    class SoundCardPort {
        + compositeKey(cardId unsigned_int, portName QString) QString
    }

    class DefSinkInter {
        + activePort() Port
        + card() unsigned_int
    }

    class Port {
        + name QString
    }

    SoundApplet --> DefSinkInter : uses
    SoundApplet --> SoundCardPort : uses
    DefSinkInter --> Port : returns

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File-Level Changes

Change	Details	Files
Guard access to the default sink interface in removeDisabledDevice with a null check to avoid dereferencing a null pointer.	Update the conditional in removeDisabledDevice to first verify m_defSinkInter is non-null before reading activePort().name and card() Keep existing behavior of disabling the device when the default sink matches the removed port and card, now safely guarded	plugins/dde-dock/sound/soundapplet.cpp

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[deepin-ci-robot]

deepin pr auto review

这段代码修改主要是为了防止空指针解引用（Null Pointer Dereference）导致的程序崩溃。以下是对该修改的详细审查意见：

1. 语法逻辑审查

• 修改点分析：在 if 条件判断中增加了 m_defSinkInter 的非空检查。
• 逻辑正确性：修改后的逻辑是正确的。在访问 m_defSinkInter 的成员函数 activePort() 和 card() 之前，先判断指针本身是否有效。如果 m_defSinkInter 为 nullptr，后续的成员访问会导致程序崩溃。
• 逻辑完整性：该修改确保了在 m_defSinkInter 为空时，不会执行后续的条件判断，从而避免了潜在的崩溃风险。

2. 代码质量审查

• 防御性编程：这是一个典型的防御性编程实践，通过增加前置条件检查来增强代码的健壮性。
• 可读性：修改后的代码依然保持了良好的可读性，条件判断清晰明确。
• 一致性：建议检查项目中其他使用 m_defSinkInter 的地方，确保所有访问该指针的地方都进行了非空检查，以保持代码风格的一致性。

3. 代码性能审查

• 性能影响：增加一个指针的非空检查对性能的影响微乎其微，因为这是一个简单的指针比较操作，在现代处理器上几乎可以忽略不计。
• 优化建议：无需进一步优化，当前的性能开销是完全可以接受的。

4. 代码安全审查

• 安全性提升：该修改显著提高了代码的安全性，防止了因空指针解引用导致的程序崩溃（Segmentation Fault）。
• 潜在风险：虽然该修改避免了直接崩溃，但需要考虑 m_defSinkInter 为空时的业务逻辑是否正确。例如，是否需要在 m_defSinkInter 为空时执行其他操作（如记录日志或尝试重新初始化）。

5. 改进建议

1. 日志记录：在 m_defSinkInter 为空时，建议记录日志，以便后续排查问题。例如：

   if (!m_defSinkInter) {
       qWarning() << "m_defSinkInter is null in SoundApplet::removeDisabledDevice";
       return;
   }

2. 空指针处理：如果 m_defSinkInter 为空是一个异常情况，可以考虑抛出异常或返回错误码，而不是静默处理。
3. 代码复用：如果 m_defSinkInter 的非空检查在多个地方重复出现，可以封装为一个辅助函数，例如：

   bool SoundApplet::isDefaultSinkValid() const {
       return m_defSinkInter != nullptr;
   }

6. 总结

该修改是一个简单但有效的改进，显著提高了代码的健壮性和安全性。建议结合日志记录和错误处理机制，进一步完善代码的可靠性。

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider using an early return guard (e.g., if (!m_defSinkInter) return;) at the top of removeDisabledDevice to keep the null check separate and make the condition on activePort().name and card() easier to read.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider using an early return guard (e.g., `if (!m_defSinkInter) return;`) at the top of `removeDisabledDevice` to keep the null check separate and make the condition on `activePort().name` and `card()` easier to read.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, BLumia, mhduiy

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