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authorMike Kaganski <mike.kaganski@collabora.com>2017-11-02 13:22:41 +0300
committerMike Kaganski <mike.kaganski@collabora.com>2017-11-04 15:24:32 +0100
commite3530d2c9d5dc98c6bacf243c163d651624e1ba6 (patch)
treee9f124596df0c4b2a3e345a3b58f67d4563aae24 /include/comphelper
parentfce7a0b3606f216f68a0f2e3591182c4358b88ff (diff)
Make Windows error reporting more robust
https://msdn.microsoft.com/en-us/library/ms679351 describes that "it is unsafe to take an arbitrary system error code returned from an API and use FORMAT_MESSAGE_FROM_SYSTEM without FORMAT_MESSAGE_IGNORE_INSERTS" Previously in case when an error string would contain inserts, function returned error, so the error message wasn't shown (at least it didn't crash, thanks to nullptr as the function's last argument). As the function may fail, we now pre-nullify the buffer pointer to avoid dereferencing uninitialized pointer later (though at least for some Windows versions, the function nullifies the pointer in case of FORMAT_MESSAGE_ALLOCATE_BUFFER, but there's no explicit guarantee of this). Also release of allocated buffer is changed to recommended use of HeapFree. The code that doesn't make use of OUString is left directly calling FormatMessage, to avoid introducing new dependencies. Where it makes sense, we now use WindowsErrorString from <comphelper/windowserrorstring.hxx> Change-Id: I834c08eb6d92987e7d3d01e2c36ec55e42aea848 Reviewed-on: https://gerrit.libreoffice.org/44206 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk> Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Diffstat (limited to 'include/comphelper')
-rw-r--r--include/comphelper/windowserrorstring.hxx4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/comphelper/windowserrorstring.hxx b/include/comphelper/windowserrorstring.hxx
index bb4b16241ca5..1b50f1eadb58 100644
--- a/include/comphelper/windowserrorstring.hxx
+++ b/include/comphelper/windowserrorstring.hxx
@@ -21,7 +21,7 @@ inline OUString WindowsErrorString(DWORD nErrorCode)
{
LPWSTR pMsgBuf;
- if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+ if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
nErrorCode,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
@@ -33,7 +33,7 @@ inline OUString WindowsErrorString(DWORD nErrorCode)
OUString result(o3tl::toU(pMsgBuf));
result.endsWith("\r\n", &result);
- LocalFree(pMsgBuf);
+ HeapFree(GetProcessHeap(), 0, pMsgBuf);
return result;
}