AES-CCM authentication flush may load out of scope data

[tkanteck]

On AES-CCM authentication, NULL lanes can load out of scope data that in some scenarios may lead to segmentation fault, i.e.:

• flush operation on a min length lane not processed yet (AAD + block 0 to be done)
• big packet size on a valid lane
• specific memory layout: invalid memory after IMB_MGR structure

Potential out of scope data being loaded is subject of CBC-MAC computation (not copied or leaked anywhere).

Affected library versions from v0.53 to v1.2 and all architectures.

The fix is in progress and it will be part of v1.3 release.