RFR: 8303669: SelectVersion indexes past the end of the argv array [v2]

[Adam Sotona]

> libjli/java.c's SelectVersion method receives argc and argv but ignores argc in some circumstances an instead checks if *argv == 0 in its while loop, which results in a segmentation fault if the provided array is not NULL terminated. 
> 
> This patch counts down argc in the while loops instead of looking for zero termination.
> 
> Please review.
> 
> Thank you,
> Adam

Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:

  added test

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13775/files
  - new: https://git.openjdk.org/jdk/pull/13775/files/2c46bb40..395cf2e7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13775&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13775&range=00-01

  Stats: 8 lines in 2 files changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13775.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13775/head:pull/13775

PR: https://git.openjdk.org/jdk/pull/13775