Description:
------------
On Windows, for the flatfile, inifile, cdb and cdb_make handlers,
dba_popen() opens a persistent stream.  Afterwards, it tries to
cast that stream to a file descriptor; if that fails, it closes
the stream, but fails to properly distinguish between persistent
and non-persistent streams, so the handle isn't preserved.  When
the persistent streams are freed during request shutdown,
accessing the stream can cause a segfault.

Obviously, this is a use-after-free scenario, but I am not sure
whether this should be regarded as a security issue, since DBA
especially with these drivers is likely rarely used in production.
Furthermore, it seems that issue hasn't been reported already,
although it is likely there for a very long time.

Stas, what do you think?


Test script:
---------------
nmake test TESTS=ext\dba\tests\bug65708.phpt

Expected result:
----------------
test succeeds

Actual result:
--------------
test fails with

========DIFF========
005+ 
006+ Termsig=-1073741819
========DONE========