【OLK-5.10】当前版本添加块设备没有错误处理，添加块设备错误时会导致内核panic

【严重程度】 一般
【特性】 block驱动/block
【重现类型】 有条件必然重现
【定位分析】 </p><p><br></p><p>当前驱动没有对创建设备失败时进行错误处理，导致在add_dsik失败时驱动无法感知，导致驱动在使用或者删除时会造成空指针引用，导致内核panic，</p><p>一个典型的例子是:</p><p>调用栈是: </p><div class="ql-code-block-container" spellcheck="false"><div class="ql-code-block" data-language="plain">删除设备时空指针引用</div><div class="ql-code-block" data-language="plain">del_gendisk</div><div class="ql-code-block" data-language="plain"> device_del</div><div class="ql-code-block" data-language="plain">  kill_device</div><div class="ql-code-block" data-language="plain">   if (dev-&gt;p-&gt;dead)  -&gt;空指针引用</div><div class="ql-code-block" data-language="plain"><br></div><div class="ql-code-block" data-language="plain">创建块设备时分配失败</div><div class="ql-code-block" data-language="plain">查看 dev-&gt;p 何时分配的</div><div class="ql-code-block" data-language="plain">device_add_disk</div><div class="ql-code-block" data-language="plain"> __device_add_disk</div><div class="ql-code-block" data-language="plain">  register_disk</div><div class="ql-code-block" data-language="plain">   device_add</div><div class="ql-code-block" data-language="plain">    device_private_init</div><div class="ql-code-block" data-language="plain">     dev-&gt;p = kzalloc  -&gt;分配失败</div></div><p>相关bugzilla: http://openeuler.huawei.com/bugzilla/show_bug.cgi?id=188162</p><p><br></p><p>

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GVPopenEuler/kernel

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