[llvm-bugs] [Bug 42795] New: UBSan failure on NtCurrentTeb()

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42795

            Bug ID: 42795
           Summary: UBSan failure on NtCurrentTeb()
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jvapen at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

UBSan seems to fail when calling NtCurrentTeb.
As I don't have enough knowledge of implementation, I can't tell is this is a
result of clang not initializing some information correctly OR something
strange in the MSVC implementation.

// C:\DevStudio\LLVM_7_0_0\bin\clang-cl.exe /EHsc /std:c++17
-fcolor-diagnostics -ferror-limit=1 -fsanitize=undefined
-fno-sanitize-recover=all  m.cpp
#include <iostream>
#include <windows.h>

int main(int, char **) {
   std::cout << static_cast<void*>(NtCurrentTeb()) << std::endl;
  return 0;
}

>> Result:
C:\Program Files (x86)\Windows
Kits\10\Include\10.0.17763.0\um\winnt.h:22426:41: runtime error: member access
within null pointer of type 'NT_TIB' (aka '_NT_TIB')

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