OSV-2023-1150 Heap-buffer-overflow in pcpp::computeChecksum

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=64122 Crash type: Heap-buffer-overflow READ 2 Crash state: pcpp::computeChecksum pcpp::IPv4Layer::computeCalculateFields pcpp::Packet::computeCalculateFields...