Обсуждение: pgsql: Fix low-probability memory leak in regex execution.

Fix low-probability memory leak in regex execution.

After an internal failure in shortest() or longest() while pinning down the
exact location of a match, find() forgot to free the DFA structure before
returning.  This is pretty unlikely to occur, since we just successfully
ran the "search" variant of the DFA; but it could happen, and it would
result in a session-lifespan memory leak since this code uses malloc()
directly.  Problem seems to have been aboriginal in Spencer's library,
so back-patch all the way.

In passing, correct a thinko in a comment I added awhile back about the
meaning of the "ntree" field.

I happened across these issues while comparing our code to Tcl's version
of the library.

Branch
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REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/28c396134e0640e21610a984b89393825753b30d

Modified Files
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src/backend/regex/regexec.c |    6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)