OSV-2020-111 Heap-use-after-free in int std::__1::__cxx_atomic_fetch_sub<int>

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21604 Crash type: Heap-use-after-free WRITE 4 Crash state: int std::1::cxxatomicfetchsub std::1::atomicbase::operator-- Object::free...