RFR: JDK-8262472: Buffer overflow in UNICODE::as_utf8 for zero length output buffer [v2]

[Ioi Lam]

On Mon, 1 Mar 2021 05:28:08 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> This one is trivial and probably inconsequential, but lets fix it anyway.
>> 
>> There is a buffer overflow in both variants of UNICODE::as_utf8, where in case of truncation due to a zero length output buffer the terminating zero still gets written.
>> 
>> Added fix + gtest. Ran gtest.
>
> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
> 
>   assert instead

LGTM

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2753