[openssl-dev] [openssl.org #3797] [PATCH] evp: fix memory corruption on absent payload

[Fedor Indutny via RT]

Hello!

aes-128-cbc-hmac-sha1, aes-256-cbc-hmac-sha1 ciphers expect the AEAD
payload, but fail to operate if it wasn't supplied. In fact, in case of
absent payload - `plen` is going to be `NO_PAYLOAD_LENGTH` and the
memory will be corrupted (which sometimes leads to the crash).

NOTE: 41cf2d2518f8b7f31287984ea9f13bc9d55205dc implicitly fixes this
in 1.0.2, so this commit could be considered to be a partial back-port
of that one.

Attached is the suggested patch.

Thank you,
Fedor.

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