CVE-2019-17211: Integer Overflow or Wraparound

An integer overflow was discovered in the CoAP library in Arm Mbed OS 5.14.0. The function sncoapbuildercalcneededpacketdatasize2 is used to calculate the required memory for the CoAP message from the sncoaphdrs data structure. Both returnedbytecount and srccoapmsgptr-payloadlen are of type...