CVE-2020-10724: Integer Overflow

A vulnerability was found in DPDK through version 18.11, The vhost crypto library code contains a post message handler (vhostcryptomsgposthandler) which calls vhostcryptocreatesess() which in turn calls transformcipherparam() depending on the operation type. It is transformcipherparam() that handles the payload data. The payload contains a cipher key length and a static VHOSTUSERCRYPTOMAXCIPHERKEYLENGTH (64) byte key buffer. When transformcipherparam() handles the payload data it does not check to see if the buffer length doesn't exceed VHOSTUSERCRYPTOMAXCIPHERKEYLENGTH. This missing check can cause out of bound reads which could trigger a crash or a potential information leak. Also, the vhost crypto library code contains a post message handler (vhostcryptomsgposthandler) which calls vhostcryptocreatesess() which in turn calls transformchainparam() depending on the operation type. It is transformchainparam() that handles the payload data. The payload contains a cipher key length and a static VHOSTUSERCRYPTOMAXCIPHERKEYLENGTH (64) byte key buffer, it also contains a digest length and a static authentication key buffer (size: VHOSTUSERCRYPTOMAXHMACKEYLENGTH(512)) and authentication key buffer length. None of these length values are validated. Which can lead to reading out of bound.