[libc++] Fix erroneous internal capacity evaluation in vector<bool> #120577
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@llvm/pr-subscribers-libcxx Author: Peng Liu (winner245) ChangesFull diff: https://github.com/llvm/llvm-project/pull/120577.diff 1 Files Affected:
diff --git a/libcxx/include/__vector/vector_bool.h b/libcxx/include/__vector/vector_bool.h
index 36eb7f350ac406..2409626ad20d9c 100644
--- a/libcxx/include/__vector/vector_bool.h
+++ b/libcxx/include/__vector/vector_bool.h
@@ -115,7 +115,7 @@ class _LIBCPP_TEMPLATE_VIS vector<bool, _Allocator> {
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static size_type
__external_cap_to_internal(size_type __n) _NOEXCEPT {
- return (__n - 1) / __bits_per_word + 1;
+ return (__n + __bits_per_word - 1) / __bits_per_word;
}
public:
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This PR fixes the erroneous internal capacity evaluation in
vector<bool>, which caused a subsequent SIGSEGV error when callingflip()onvector<bool>. By fixing the internal capacity evaluation, the SIGSEGV is automatically resolved.Closes #121726.