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DNAMES: Server crashes in Item_func_dyncol_exists::val_int => String::charset with NULL as a column name/number

Description

This is similar to MDEV-490, but since it comes to the crash from a different function, and not all functions produce the crash, I'm filing it separately.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 #3 0x083cea84 in handle_fatal_signal (sig=11) at sql/signal_handler.cc:262 #4 <signal handler called> #5 0x081acb0a in String::charset (this=0x0) at sql/sql_string.h:113 #6 0x0840ab33 in Item_func_dyncol_exists::val_int (this=0x971ed48) at sql/item_cmpfunc.cc:6068 #7 0x083eb508 in Item::send (this=0x971ed48, protocol=0x966f7b0, buffer=0xad1530b4) at sql/item.cc:6357 #8 0x081aad13 in Protocol::send_result_set_row (this=0x966f7b0, row_items=0x9670e78) at sql/protocol.cc:900 #9 0x08207a4e in select_send::send_data (this=0x971eec0, items=...) at sql/sql_class.cc:2275 #10 0x0826d5cb in JOIN::exec (this=0x971eed0) at sql/sql_select.cc:2229 #11 0x0826ff66 in mysql_select (thd=0x966f350, rref_pointer_array=0x9670f20, tables=0x0, wild_num=0, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x971eec0, unit=0x9670930, select_lex=0x9670de0) at sql/sql_select.cc:3050 #12 0x08267932 in handle_select (thd=0x966f350, lex=0x96708cc, result=0x971eec0, setup_tables_done_option=0) at sql/sql_select.cc:313 #13 0x08243498 in execute_sqlcom_select (thd=0x966f350, all_tables=0x0) at sql/sql_parse.cc:4621 #14 0x0823c432 in mysql_execute_command (thd=0x966f350) at sql/sql_parse.cc:2189 #15 0x08245a89 in mysql_parse (thd=0x966f350, rawbuf=0x971ea48 "SELECT COLUMN_EXISTS( COLUMN_CREATE(1,'a'), NULL)", length=49, parser_state=0xad153da4) at sql/sql_parse.cc:5736 #16 0x08239ed4 in dispatch_command (command=COM_QUERY, thd=0x966f350, packet=0x9718d19 "", packet_length=49) at sql/sql_parse.cc:1055 #17 0x08239399 in do_command (thd=0x966f350) at sql/sql_parse.cc:794 #18 0x08325471 in do_handle_one_connection (thd_arg=0x966f350) at sql/sql_connect.cc:1253 #19 0x08324fbc in handle_one_connection (arg=0x966f350) at sql/sql_connect.cc:1168 #20 0x0854fd1b in pfs_spawn_thread (arg=0x975fae0) at storage/perfschema/pfs.cc:1015 #21 0xb77c4b25 in start_thread () from /lib/libpthread.so.0
1 2 3 4 Some pointers may be invalid and cause the dump to abort. Query (0x971ea48): SELECT COLUMN_EXISTS( COLUMN_CREATE(1,'a'), NULL) Connection ID (thread ID): 2 Status: NOT_KILLED
1 2 3 4 5 bzr version-info revision-id: sanja@askmonty.org-20120823152900-3ngz79t2yvtq28f6 date: 2012-08-23 18:29:00 +0300 build-date: 2012-08-26 22:37:27 +0400 revno: 3496
1 SELECT COLUMN_EXISTS(COLUMN_CREATE(1,'a'), NULL);

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Assignee

Oleksandr Byelkin

Reporter

Elena Stepanova

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Major