pgsql: to_char(): prevent writing beyond the allocated buffer

to_char(): prevent writing beyond the allocated buffer

Previously very long localized month and weekday strings could
overflow the allocated buffers, causing a server crash.

Reported and patch reviewed by Noah Misch. Backpatch to all
supported versions.

Security: CVE-2015-0241

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/e09651e9d90011ff634ac1c10c8e67e3881687c8

Modified Files
--------------
src/backend/utils/adt/formatting.c | 139 ++++++++++++++++++++++++++++++++----
1 file changed, 125 insertions(+), 14 deletions(-)

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