[pgpool-committers: 5432] pgpool: Fix corner case bug with strip_quote().

[Tatsuo Ishii]

Fix corner case bug with strip_quote().

strip_quote(), which is called by pattern_compare() did not properly
handle empty query string case. In the worst case it could wipe out
memory after a pointer returned from malloc(), which could cause a
segmentation fault in free() called in pattern_compare().

Per bug 458.

Branch
------
V3_6_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=f7d0c969550822ae85e2cdbee79036eb25b1757e

Modified Files
--------------
src/utils/pool_select_walker.c | 38 ++++++++++++++++++++++++++++++++------
1 file changed, 32 insertions(+), 6 deletions(-)