use-after-poison issue of MariaDB server

INSTALL PLUGIN DEALLOCATE SONAME 'x' ;

Version: '10.6.5-MariaDB'  socket: '/tmp/mysql_mar.sock'  port: 3309  Source distribution

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==283607==ERROR: AddressSanitizer: use-after-poison on address 0x62b000077306 at pc 0x56165517504e bp 0x7f3e39319c80 sp 0x7f3e39319c70

READ of size 1 at 0x62b000077306 thread T48

    #0 0x56165517504d in my_strcasecmp_8bit /home/supersix/fuzz/security/MariaDB/server/strings/ctype-simple.c:265

    #1 0x561653282063 in fix_dl_name /home/supersix/fuzz/security/MariaDB/server/sql/sql_plugin.cc:376

    #2 0x561653282063 in plugin_add /home/supersix/fuzz/security/MariaDB/server/sql/sql_plugin.cc:1125

    #3 0x561653293f30 in mysql_install_plugin(THD*, st_mysql_const_lex_string const*, st_mysql_const_lex_string const*) /home/supersix/fuzz/security/MariaDB/server/sql/sql_plugin.cc:2270

    #4 0x56165326a1df in mysql_execute_command(THD*, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql_parse.cc:5899

    #5 0x561653225684 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /home/supersix/fuzz/security/MariaDB/server/sql/sql_parse.cc:8030

    #6 0x56165325b0b3 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql_parse.cc:1896

    #7 0x561653260513 in do_command(THD*, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql_parse.cc:1404

    #8 0x5616537226fc in do_handle_one_connection(CONNECT*, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql_connect.cc:1418

    #9 0x561653723e56 in handle_one_connection /home/supersix/fuzz/security/MariaDB/server/sql/sql_connect.cc:1312

    #10 0x56165456fd2f in pfs_spawn_thread /home/supersix/fuzz/security/MariaDB/server/storage/perfschema/pfs.cc:2201

    #11 0x7f3e5895a608 in start_thread /build/glibc-ZN95T4/glibc-2.31/nptl/pthread_create.c:477

    #12 0x7f3e5852e292 in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x122292)

0x62b000077306 is located 262 bytes inside of 24624-byte region [0x62b000077200,0x62b00007d230)

allocated by thread T48 here:

    #0 0x7f3e58ee5bc8 in malloc (/lib/x86_64-linux-gnu/libasan.so.5+0x10dbc8)

    #1 0x5616550fbc1c in my_malloc /home/supersix/fuzz/security/MariaDB/server/mysys/my_malloc.c:90

    #2 0x5616550e28c8 in reset_root_defaults /home/supersix/fuzz/security/MariaDB/server/mysys/my_alloc.c:148

    #3 0x5616530d2773 in THD::init_for_queries() /home/supersix/fuzz/security/MariaDB/server/sql/sql_class.cc:1406

    #4 0x5616537201ea in prepare_new_connection_state(THD*) /home/supersix/fuzz/security/MariaDB/server/sql/sql_connect.cc:1240

    #5 0x561653720efa in thd_prepare_connection(THD*) /home/supersix/fuzz/security/MariaDB/server/sql/sql_connect.cc:1333

    #6 0x561653720efa in thd_prepare_connection(THD*) /home/supersix/fuzz/security/MariaDB/server/sql/sql_connect.cc:1322

    #7 0x561653722663 in do_handle_one_connection(CONNECT*, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql_connect.cc:1408

    #8 0x561653723e56 in handle_one_connection /home/supersix/fuzz/security/MariaDB/server/sql/sql_connect.cc:1312

    #9 0x56165456fd2f in pfs_spawn_thread /home/supersix/fuzz/security/MariaDB/server/storage/perfschema/pfs.cc:2201

    #10 0x7f3e5895a608 in start_thread /build/glibc-ZN95T4/glibc-2.31/nptl/pthread_create.c:477

Thread T48 created by T0 here:

    #0 0x7f3e58e12805 in pthread_create (/lib/x86_64-linux-gnu/libasan.so.5+0x3a805)

    #1 0x56165456ffe2 in my_thread_create /home/supersix/fuzz/security/MariaDB/server/storage/perfschema/my_thread.h:48

    #2 0x56165456ffe2 in pfs_spawn_thread_v1 /home/supersix/fuzz/security/MariaDB/server/storage/perfschema/pfs.cc:2252

    #3 0x561652ef4b48 in inline_mysql_thread_create /home/supersix/fuzz/security/MariaDB/server/include/mysql/psi/mysql_thread.h:1139

    #4 0x561652ef4b48 in create_thread_to_handle_connection(CONNECT*) /home/supersix/fuzz/security/MariaDB/server/sql/mysqld.cc:5922

    #5 0x561652f04235 in handle_accepted_socket(st_mysql_socket, st_mysql_socket) /home/supersix/fuzz/security/MariaDB/server/sql/mysqld.cc:6043

    #6 0x561652f0500e in handle_connections_sockets() /home/supersix/fuzz/security/MariaDB/server/sql/mysqld.cc:6167

    #7 0x561652f0719b in mysqld_main(int, char**) /home/supersix/fuzz/security/MariaDB/server/sql/mysqld.cc:5817

    #8 0x7f3e584330b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)

SUMMARY: AddressSanitizer: use-after-poison /home/supersix/fuzz/security/MariaDB/server/strings/ctype-simple.c:265 in my_strcasecmp_8bit

Shadow bytes around the buggy address:

  0x0c5680006e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c5680006e20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c5680006e30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c5680006e40: 00 00 00 00 00 00 f7 00 00 00 00 00 00 00 00 00

  0x0c5680006e50: 00 00 00 00 00 00 03 f7 00 00 00 00 05 f7 00 03

=>0x0c5680006e60:[f7]02 f7 00 00 00 00 00 00 00 f7 f7 f7 f7 f7 f7

  0x0c5680006e70: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c5680006e80: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c5680006e90: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c5680006ea0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c5680006eb0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

Shadow byte legend (one shadow byte represents 8 application bytes):

  Addressable:           00

  Partially addressable: 01 02 03 04 05 06 07

  Heap left redzone:       fa

  Freed heap region:       fd

  Stack left redzone:      f1

  Stack mid redzone:       f2

  Stack right redzone:     f3

  Stack after return:      f5

  Stack use after scope:   f8

  Global redzone:          f9

  Global init order:       f6

  Poisoned by user:        f7

  Container overflow:      fc

  Array cookie:            ac

  Intra object redzone:    bb

  ASan internal:           fe

  Left alloca redzone:     ca

  Right alloca redzone:    cb

  Shadow gap:              cc

==283607==ABORTING