BUG #2120: Crash when doing UTF8<->ISO_8859_8 encoding conversion

The following bug has been logged online:

Bug reference: 2120
Logged by: Sagi Bashari
Email address: sagi(at)adamnet(dot)co(dot)il
PostgreSQL version: 8.1.1
Operating system: Debian Sarge
Description: Crash when doing UTF8<->ISO_8859_8 encoding conversion
Details:

Postgresql crashes when a client with ISO_8859_8 encoding tries to select
data from a utf8 database.

I have compiled postgresql 8.1.1 from scratch with the following commands:
./configure --prefix=/home/sagi/temp/pgtest --enable-debug
make
make install
mkdir /home/sagi/temp/pgtest/data
/home/sagi/temp/pgtest/bin/initdb -D /home/sagi/temp/pgtest/data/
/home/sagi/temp/pgtest/bin/postmaster -D /home/sagi/temp/pgtest/data

Created a utf8 database:
./createdb test -E utf8

And ran 'SET client_encoding = 'ISO_8859_8'; SELECT '';' inside
`psql test`.

That's ISO_8859_8 hebrew text inside the SELECT. Here's a file containing
the query (incase the mail breaks it):
http://future.adamnet.co.il/~sagi/temp/enc.sql

Psql returned the following message:
server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.

The database log:
LOG: server process (PID 1290) was terminated by signal 11

Backtrace:
Core was generated by `postgres: sagi test [local] idle
'.
Program terminated with signal 11, Segmentation fault.

#0 0x0823a1a6 in compare2 ()
#1 0x40100b52 in bsearch () from /lib/libc.so.6
#2 0x0823a41c in LocalToUtf ()
#3 0x40df8909 in iso8859_to_utf8 () from
/home/sagi/temp/pgtest/lib/postgresql/utf8_and_iso8859.so
#4 0x08233112 in FunctionCall5 ()
#5 0x0823adc8 in perform_default_encoding_conversion ()
#6 0x0823acd3 in pg_client_to_server ()
#7 0x081508d4 in pq_getmsgstring ()
#8 0x081b924e in PostgresMain ()
#9 0x08191b1c in BackendRun ()
#10 0x08191565 in BackendStartup ()
#11 0x0818f7c1 in ServerLoop ()
#12 0x0818eb5a in PostmasterMain ()
#13 0x08150e0e in main ()