fuzz: parse_sql target

[catenacyber]

Finds a buffer off by one overread with SELECT@@SELECT

==23857==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x502000001a5f at pc 0x7f04fa2568d6 bp 0x7ffe0c645080 sp 0x7ffe0c645078 READ of size 1 at 0x502000001a5f thread T0 #0 0x7f04fa2568d5 in Lex_input_stream::yyPeek() const /src/mysql-server/sql/sql_lex.h:3524:12 #1 0x7f04fa259968 in consume_optimizer_hints(Lex_input_stream*) /src/mysql-server/sql/sql_lex.cc:866:18 #2 0x7f04fa258326 in find_keyword(Lex_input_stream*, unsigned int, bool) /src/mysql-server/sql/sql_lex.cc:927:11 #3 0x7f04fa240bf3 in lex_one_token(Lexer_yystype*, THD*) /src/mysql-server/sql/sql_lex.cc:2109:23 #4 0x7f04fa23e109 in my_sql_parser_lex(MY_SQL_PARSER_STYPE*, MY_SQL_PARSER_LTYPE*, THD*) /src/mysql-server/sql/sql_lex.cc:1392:11 #5 0x7f04fdeff656 in my_sql_parser_parse(THD*, Parse_tree_root**) /src/mysql-server/build/sql/sql_yacc.cc:26517:16 #6 0x7f04fa1ee3bf in THD::sql_parser() /src/mysql-server/sql/sql_class.cc:3176:7 #7 0x7f04fa760005 in parse_sql(THD*, Parser_state*, Object_creation_ctx*) /src/mysql-server/sql/sql_parse.cc:7218:40 #8 0x55e9f16f7048 in LLVMFuzzerTestOneInput /src/mysql-server/sql/fuzz/fuzz_sql_parse.cc:140:5 

[mysql-oca-bot]

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Thanks

[catenacyber]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for your contribution. Your code has been assigned to an internal queue. Please follow
bug http://bugs.mysql.com/bug.php?id=118349 for updates.
Thanks