OSV-2020-729 Stack-buffer-overflow in ot::MeshCoP::Leader::HandlePetition

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13335 Crash type: Stack-buffer-overflow READ 1 Crash state: ot::MeshCoP::Leader::HandlePetition ot::Coap::CoapBase::ProcessReceivedRequest ot::Ip6::Udp::HandleMessage...