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@philnik777 philnik777 marked this pull request as ready for review August 5, 2025 17:55
@philnik777 philnik777 requested a review from a team as a code owner August 5, 2025 17:55
@llvmbot llvmbot added the libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. label Aug 5, 2025
@philnik777 philnik777 merged commit bb3c060 into llvm:main Aug 5, 2025
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@philnik777 philnik777 deleted the fix_ubsan branch August 5, 2025 17:55
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llvmbot commented Aug 5, 2025

@llvm/pr-subscribers-libcxx

Author: Nikolas Klauser (philnik777)

Changes

Full diff: https://github.com/llvm/llvm-project/pull/152181.diff

1 Files Affected:

  • (modified) libcxx/include/__tree (+2-2)
diff --git a/libcxx/include/__tree b/libcxx/include/__tree
index 1b1bb538029da..6ca1a623536f2 100644
--- a/libcxx/include/__tree
+++ b/libcxx/include/__tree
@@ -1445,8 +1445,8 @@ __tree<_Tp, _Compare, _Allocator>::__tree(const __tree& __t)
 
   *__root_ptr()       = static_cast<__node_base_pointer>(__copy_construct_tree(__t.__root()));
   __root()->__parent_ = __end_node();
-  __begin_node_ = static_cast<__end_node_pointer>(std::__tree_min(static_cast<__node_base_pointer>(__end_node())));
-  __size_       = __t.size();
+  __begin_node_       = static_cast<__end_node_pointer>(std::__tree_min(__end_node()->__left_));
+  __size_             = __t.size();
 }
 
 template <class _Tp, class _Compare, class _Allocator>

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