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Reject array insert(pos, first, last) iterators not pointing into an array

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The array-range insert() overload checked that pos fits the current
value and that first/last share the same owning value, but never
verified that value is itself an array. Passing iterators from an
object, a primitive, or null handed value-initialized (singular)
std::vector iterators straight to array_t::insert(), which is
undefined behavior. Add the missing is_array() check, mirroring the
equivalent check already present in the object-range insert()
overload.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-05 17:05:57 +02:00
parent 2cee81ae6b
commit 38de588582
4 changed files with 28 additions and 0 deletions
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single_include/nlohmann/json.hpp
+6
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@@ -24923,6 +24923,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
JSON_THROW(invalid_iterator::create(211, "passed iterators may not belong to container", this));
}
// passed iterators must belong to arrays
if (JSON_HEDLEY_UNLIKELY(!first.m_object->is_array()))
{
JSON_THROW(invalid_iterator::create(202, "iterators first and last must point to arrays", this));
}
// insert to array and return iterator
return insert_iterator(pos, first.m_it.array_iterator, last.m_it.array_iterator);
}