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Bug in OnHookLoadLibrary()

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akur View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote akur Quote  Post ReplyReply Direct Link To This Post Topic: Bug in OnHookLoadLibrary()
    Posted: 21 August 2012 at 1:52am
We just found out that CXTPSkinManagerApiHook's methods for hooking LoadLibrary() can accidentally change the GetLastError() value returned by system. To overcome some problems this caused to our application, we needed to fix XTP code like this:

HMODULE WINAPI CXTPSkinManagerApiHook::OnHookLoadLibraryW(PCWSTR pszModuleName)
{
    typedef HMODULE (WINAPI* LPFNLOADLIBRARYW)(PCWSTR pszModuleName);

    PROC pfnOrig = GetOriginalProc(xtpSkinApiLoadLibraryW);
    if (!pfnOrig)
        return ::LoadLibraryW(pszModuleName);

    HMODULE hmod = ((LPFNLOADLIBRARYW)pfnOrig)(pszModuleName);

    // Added test for hmod: the fn. HackModuleOnLoad() can be called only when
    // hmod is not-NULL, it means the module (some dll) was successfully loaded.
    // Otherwise the global 'last error value' could be changed.
    if (hmod)
        GetInstance()->HackModuleOnLoad(hmod, 0);

    return hmod;
}

Can you please add this fix to your future releases, on all code places where relevant? Thank you.

It's the same case at least with the following functions:
CXTPSkinManagerApiHook::OnHookLoadLibraryA()
CXTPSkinManagerApiHook::OnHookLoadLibraryW()
CXTPSkinManagerApiHook::OnHookLoadLibraryExA()
CXTPSkinManagerApiHook::OnHookLoadLibraryExW()
CXTPSkinManagerApiHook::OnHookLoadLibraryEx2W()

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ABuenger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ABuenger Quote  Post ReplyReply Direct Link To This Post Posted: 21 August 2012 at 12:09pm
Originally posted by akur akur wrote:

Can you please add this fix to your future releases, on all code places where relevant? Thank you.

It's the same case at least with the following functions:
CXTPSkinManagerApiHook::OnHookLoadLibraryA()
CXTPSkinManagerApiHook::OnHookLoadLibraryW()
CXTPSkinManagerApiHook::OnHookLoadLibraryExA()
CXTPSkinManagerApiHook::OnHookLoadLibraryExW()
CXTPSkinManagerApiHook::OnHookLoadLibraryEx2W()


Hi,

check added for next release.

Andre

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