Fix parsing issue involving effective dates

Cory Duplantis reported that "A specially crafted journal file can
cause [an] integer underflow resulting in code execution".  Cory
provided this test case:

    Expenses:Food:Groceries             $ 37.50  ; ] [=2004/01/01]

Note the ] that comes before [ after the ;.

This issue was reported and described in great detail by Cory Duplantis
of Cisco Talos.  This issue is known as TALOS-2017-0303 and has been
assigned CVE-2017-2807.  Cory's description can be found at
https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0303

Fixes #1722

0 files changed, 0 insertions, 0 deletions