It is possible to overflow a descriptor capacity

[pan-]

If a characteristic descriptor has been instantiated with a fixed size, it should not be possible for a client to write this descriptor with a value longer than what has been provisioned.

Unfortunately, it is possible for a client to write 5 bytes in a descriptor even if the descriptor size is 4 bytes.

Reproducible by running DescriptorReadWrite_test_09.

[ciarmcom]

ARM Internal Ref: IOTSFW-2378