RFR: 8241248: NullPointerException in sun.security.ssl.HKDF.extract(HKDF.java:93)

[Alexey Bakhtin]

Hello All,

Could you please review the fix for the JDK-8241248?
The issue happens during the TLSv1.3 handshake without server stateless session resumption in case of server receives several parallel requests with the same pre_shared_key.
The main idea of the fix is to remove resuming session from the session cache in the early stage.

JBS: https://bugs.openjdk.java.net/browse/JDK-8241248
Webrev: http://cr.openjdk.java.net/~abakhtin/8241248/webrev.v0/

The test from the bug report using OpenSSL is passed ( -Djdk.tls.server.enableSessionTicketExtension=false )
javax/net/ssl and sun/security/ssl jtreg tests passed

Regards
Alexey

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Commit messages:
 - 8241248: NullPointerException in sun.security.ssl.HKDF.extract(HKDF.java:93)

Changes: https://git.openjdk.java.net/jdk/pull/3664/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3664&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8241248
  Stats: 24 lines in 2 files changed: 11 ins; 5 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3664.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3664/head:pull/3664

PR: https://git.openjdk.java.net/jdk/pull/3664