DllMain中不当操作导致死锁问题的分析--加载卸载DLL与DllMain死锁的关系

int __stdcall LdrLoadDll(int a1, int a2, int a3, int a4)
{
    ……
    LdrLockLoaderLock(1, 0, &v10);
    ……
    v6 = LdrpLoadDll(v9, a1, a2, v17, a4, 1);
    ……
    if ( v8 >= 0 )
    {
        ms_exc.disabled = -1;
        sub_7C936587(ebp0, v7);
        v6 = 0;
        goto LABEL_6;
    }

}

int __usercall sub_7C936587<eax>(int a1<ebp>, int a2<esi>)
{
    LdrpTopLevelDllBeingLoaded = a2;
    return LdrUnlockLoaderLock(1, *(_DWORD *)(a1 - 572));
}

int __stdcall LdrUnloadDll(int a1)
{
    ……
        v73 = 0;
    v70 = *(_DWORD *)(*MK_FP(__FS__, 24) + 48);
    v71 = 0;
    ms_exc.disabled = 0;
    if ( !LdrpInLdrInit )
        RtlEnterCriticalSection(&LdrpLoaderLock);
    ++LdrpActiveUnloadCount;
    if ( !LdrpShutdownInProgress )
    {
        if ( LdrpCheckForLoadedDllHandle(a1, (int)&v78) )
        {
            if ( *(_WORD *)(v78 + 56) != -1 )
            {
                ……
                if ( (unsigned __int8)LdrpActiveUnloadCount <= 1u )
                {
                    ……
                    v15 = (int *)LdrpUnloadHead;
                    v77 = (int *)LdrpUnloadHead;
                    while ( v15 != &LdrpUnloadHead )
                    {
                        ……
                        LdrpCallInitRoutine((int (__stdcall *)(_DWORD, _DWORD, _DWORD))v20, *(_DWORD *)(v78 + 24), 0, 0);
                        ……
                        v15 = (int *)LdrpUnloadHead;
                        v77 = (int *)LdrpUnloadHead;
                        ms_exc.disabled = 0;
                        v3 = 0;
                    }
                   ……
                }
            }
        }
        else
        {
            v71 = 0xC0000135u;
        }
    }
    ms_exc.disabled = -1;
    sub_7C937424();
……
    return v71;
}

int __cdecl sub_7C937424()
{
    int result; // eax@3

    --LdrpActiveUnloadCount;
    if ( !LdrpInLdrInit )
        result = RtlLeaveCriticalSection(&LdrpLoaderLock);
    return result;
}