[8u] RFA: 8164501: Uninitialised memory in byteArrayToPacket of SharedMemoryConnection.c

[Robbin Ehn]

Hi all, please consider this for backport:

"This patch makes sure pktHeader is not used uninitialized and that total_length is at least 11.
The bug is confidential, but subject and patch says alot."

Changeset applied cleanly on jdk8u-dev. (file had been moved)

Passes jdk_jdi tests in 8.

JDK9 commit: http://hg.openjdk.java.net/jdk9/hs/jdk/rev/11932b04e6a0
RFR thread: http://mail.openjdk.java.net/pipermail/serviceability-dev/2016-October/020612.html

JDK8 (conf) bug: https://bugs.openjdk.java.net/browse/JDK-8168152
JDK9 (conf) bug: https://bugs.openjdk.java.net/browse/JDK-8164501

Thanks!

/Robbin