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LP:998340 - Valgrind complains on simple selects containing expression DAY(FROM_UNIXTIME(-1))

Description

The following test case makes valgrind complain when running mariadb-5.1:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SELECT SUBSTRING('1', DAY(FROM_UNIXTIME(-1))); SELECT LEFT('1', DAY(FROM_UNIXTIME(-1))); SELECT RIGHT('1', DAY(FROM_UNIXTIME(-1))); SELECT REPEAT('1', DAY(FROM_UNIXTIME(-1))); SELECT RPAD('hi', DAY(FROM_UNIXTIME(-1)),'?'); SELECT LPAD('hi', DAY(FROM_UNIXTIME(-1)),'?'); CREATE TABLE t1 SELECT SUBSTRING('1', DAY(FROM_UNIXTIME(-1))) AS f1, LEFT('1', DAY(FROM_UNIXTIME(-1))) AS f2, RIGHT('1', DAY(FROM_UNIXTIME(-1))) AS f3, REPEAT('1', DAY(FROM_UNIXTIME(-1))) AS f4, RPAD('hi', DAY(FROM_UNIXTIME(-1)),'?') AS f5, LPAD('hi', DAY(FROM_UNIXTIME(-1)),'?') AS f6; SHOW CREATE TABLE t1; DROP TABLE t1;

(see also bug##12634989 from mysql-trunk)

The complains are like this:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ==24162== Conditional jump or move depends on uninitialised value(s) ==24162== at 0x622A1A: Item_func_substr::fix_length_and_dec() (item_strfunc.cc:1273) ==24162== by 0x5EF4B7: Item_func::fix_fields(THD*, Item**) (item_func.cc:205) ==24162== by 0x61E3DA: Item_str_func::fix_fields(THD*, Item**) (item_strfunc.cc:67) ==24162== by 0x70BE1B: setup_fields(THD*, Item**, List<Item>&, enum_mark_columns, List<Item>*, bool) (sql_base.cc:7714) ==24162== by 0x71F07B: JOIN::prepare(Item***, TABLE_LIST*, unsigned int, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, st_select_lex*, st_select_lex_unit*) (sql_select.cc:530) ==24162== by 0x7268A7: mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:2545) ==24162== by 0x71E818: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:280) ==24162== by 0x6BD119: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5241) ==24162== by 0x6B4232: mysql_execute_command(THD*) (sql_parse.cc:2380) ==24162== by 0x6BF845: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6216) ==24162== by 0x6B1B30: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1294) ==24162== by 0x6B0AE0: do_command(THD*) (sql_parse.cc:906) ==24162== by 0x6AD563: handle_one_connection (sql_connect.cc:1208) ==24162== by 0x5D16A4E: start_thread (in /lib64/libpthread-2.11.2.so)

Most probably we have the same problem in other versions of MariaDB

Environment

None

Status

Assignee

Sergei Golubchik

Reporter

Igor Babaev

Labels

Fix versions

Affects versions

5.2.12
5.1.62

Priority

Trivial