[clang-tidy] Potential memory leak?

clang-tidy on a project brought this to my attention:
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:375:17: error: Potential memory leak [clang-analyzer-cplusplus.NewDeleteLeaks,-warnings-as-errors]
         m_sign = o.m_sign;
                ^
...
pravete_source.cpp:534:25: note: Calling copy assignment operator for 'number<boost::multiprecision::backends::cpp_int_backend<0, 0, boost::multiprecision::signed_magnitude, boost::multiprecision::unchecked, std::allocator<unsigned long long>>, boost::multiprecision::et_on>'
my_private_include_path/include/boost/multiprecision/number.hpp:243:7: note: Calling copy assignment operator for 'cpp_int_backend<0, 0, boost::multiprecision::signed_magnitude, boost::multiprecision::unchecked, std::allocator<unsigned long long>>'
      m_backend = e.m_backend;
      ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:1346:7: note: Calling 'cpp_int_base::assign'
      this->assign(o);
      ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:369:7: note: Taking true branch
      if (this != &o)
      ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:373:10: note: Calling 'cpp_int_base::resize'
         resize(o.size(), o.size());
         ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:287:85: note: '?' condition is true
      static const unsigned max_limbs = MaxBits / (CHAR_BIT * sizeof(limb_type)) + ((MaxBits % (CHAR_BIT * sizeof(limb_type))) ? 1 : 0);
                                                                                    ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:289:11: note: Assuming 'new_size' is <= 'max_limbs'
      if (new_size > max_limbs)
          ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:289:7: note: Taking false branch
      if (new_size > max_limbs)
      ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:294:11: note: Assuming 'new_size' is > 'cap'
      if (new_size > cap)
          ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:294:7: note: Taking true branch
      if (new_size > cap)
      ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:298:28: note: Calling 'new_allocator::allocate'
         limb_pointer pl = allocator().allocate(cap);
                           ^
/usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/ext/new_allocator.h:101:2: note: Taking false branch
        if (__n > this->max_size())
        ^
/usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/ext/new_allocator.h:111:27: note: Memory is allocated
        return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
                                 ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:298:28: note: Returned allocated memory
         limb_pointer pl = allocator().allocate(cap);
                           ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:300:15: note: Field 'm_internal' is false
         if (!m_internal)
              ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:300:10: note: Taking true branch
         if (!m_internal)
         ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:373:10: note: Returned allocated memory
         resize(o.size(), o.size());
         ^
my_private_include_path/include/boost/multiprecision/cpp_int.hpp:375:17: note: Potential memory leak
         m_sign = o.m_sign;
                ^
Is this a false positive ?
boostorg / multiprecision

[clang-tidy] Potential memory leak? #358
