Fix ASAN issue #959
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Fix ASAN issue #959
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ASAN report an error if we tries to downcast a misaligned address. To avoid it, we need to check if an address is valid before casting it. Here is the ASAN error: /home/runner/work/mold/mold/third-party/tbb/src/tbb/../../include/tbb/../oneapi/tbb/concurrent_hash_map.h:446:23: runtime error: downcast of misaligned address 0x000000000003 for type 'tbb::detail::d2::hash_map_iterator<tbb::detail::d2::concurrent_hash_map<std::basic_string_view<char, std::char_traits<char>>, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>>, tbb::detail::d1::tbb_hash_compare<std::basic_string_view<char, std::char_traits<char>>>, tbb::detail::d1::tbb_allocator<std::pair<const std::basic_string_view<char, std::char_traits<char>>, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>>>>>, std::pair<const std::basic_string_view<char, std::char_traits<char>>, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, st0x000000000003: note: pointer points here <memory cannot be printed> SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/runner/work/mold/mold/third-party/tbb/src/tbb/../../include/tbb/../oneapi/tbb/concurrent_hash_map.h:446:23 Signed-off-by: Rui Ueyama <ruiu@cs.stanford.edu>
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Related issue: #908 |
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Description
ASAN reports an error if we try to downcast a misaligned address. To avoid it, we need to check if an address is valid before casting it.
Here is the ASAN error:
/home/runner/work/mold/mold/third-party/tbb/src/tbb/../../include/tbb/../oneapi/tbb/concurrent_hash_map.h:446:23: runtime error: downcast of misaligned address 0x000000000003 for type 'tbb::detail::d2::hash_map_iterator<tbb::detail::d2::concurrent_hash_map<std::basic_string_view<char, std::char_traits>, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator>, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator>>>, tbb::detail::d1::tbb_hash_compare<std::basic_string_view<char, std::char_traits>>, tbb::detail::d1::tbb_allocator<std::pair<const std::basic_string_view<char, std::char_traits>, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator>, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator>>>>>>, std::pair<const std::basic_string_view<char, std::char_traits>, std::vector<std::__cxx11::basic_string<char, std::char_traits, st0x000000000003: note: pointer points here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/runner/work/mold/mold/third-party/tbb/src/tbb/../../include/tbb/../oneapi/tbb/concurrent_hash_map.h:446:23
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Tests
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Breaks backward compatibility