ASAN heap-use-after-free in strxnmov upon LOAD DATA

CREATE TABLE t (a INT);

CREATE DATABASE db;

CREATE VIEW db.v AS SELECT * FROM t;

--error ER_OPTION_PREVENTS_STATEMENT

LOAD DATA INFILE 'x' REPLACE INTO TABLE db.v;

# Cleanup

DROP DATABASE db;

DROP TABLE t;

==21596==ERROR: AddressSanitizer: heap-use-after-free on address 0x60c000029ff0 at pc 0x55e3d477e0ce bp 0x7f8a8483dde0 sp 0x7f8a8483ddd8

READ of size 1 at 0x60c000029ff0 thread T5

    #0 0x55e3d477e0cd in strxnmov /data/src/10.4/strings/strxnmov.c:66

    #1 0x55e3d2d77a95 in mysql_load(THD*, sql_exchange const*, TABLE_LIST*, List<Item>&, List<Item>&, List<Item>&, enum_duplicates, bool, bool) /data/src/10.4/sql/sql_load.cc:525

    #2 0x55e3d2da61dc in mysql_execute_command(THD*) /data/src/10.4/sql/sql_parse.cc:5184

    #3 0x55e3d2db96fe in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.4/sql/sql_parse.cc:8154

    #4 0x55e3d2d9182a in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.4/sql/sql_parse.cc:1832

    #5 0x55e3d2d8e67b in do_command(THD*) /data/src/10.4/sql/sql_parse.cc:1365

    #6 0x55e3d3122479 in do_handle_one_connection(CONNECT*) /data/src/10.4/sql/sql_connect.cc:1398

    #7 0x55e3d3121e72 in handle_one_connection /data/src/10.4/sql/sql_connect.cc:1301

    #8 0x55e3d3ce9b92 in pfs_spawn_thread /data/src/10.4/storage/perfschema/pfs.cc:1862

    #9 0x7f8a8fe07493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)

    #10 0x7f8a8dfd593e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe893e)

0x60c000029ff0 is located 112 bytes inside of 124-byte region [0x60c000029f80,0x60c000029ffc)

freed by thread T5 here:

    #0 0x7f8a90071527 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x54527)

    #1 0x55e3d469c99b in free_memory /data/src/10.4/mysys/safemalloc.c:279

    #2 0x55e3d469bfa1 in sf_free /data/src/10.4/mysys/safemalloc.c:197

    #3 0x55e3d466c9ea in my_free /data/src/10.4/mysys/my_malloc.c:222

    #4 0x55e3d2c8e9f5 in THD::set_db(st_mysql_const_lex_string const*) /data/src/10.4/sql/sql_class.cc:1462

    #5 0x55e3d2cd13a5 in mysql_change_db_impl /data/src/10.4/sql/sql_db.cc:1336

    #6 0x55e3d2cd2181 in mysql_change_db(THD*, st_mysql_const_lex_string const*, bool) /data/src/10.4/sql/sql_db.cc:1601

    #7 0x55e3d2cd2332 in mysql_opt_change_db(THD*, st_mysql_const_lex_string const*, st_mysql_lex_string*, bool, bool*) /data/src/10.4/sql/sql_db.cc:1643

    #8 0x55e3d303a773 in mysql_make_view(THD*, TABLE_SHARE*, TABLE_LIST*, bool) /data/src/10.4/sql/sql_view.cc:1352

    #9 0x55e3d2c2aa22 in open_table(THD*, TABLE_LIST*, Open_table_context*) /data/src/10.4/sql/sql_base.cc:1955

    #10 0x55e3d2c32d71 in open_and_process_table /data/src/10.4/sql/sql_base.cc:3732

    #11 0x55e3d2c35b7b in open_tables(THD*, DDL_options_st const&, TABLE_LIST**, unsigned int*, unsigned int, Prelocking_strategy*) /data/src/10.4/sql/sql_base.cc:4265

    #12 0x55e3d2c3a4bf in open_and_lock_tables(THD*, DDL_options_st const&, TABLE_LIST*, bool, unsigned int, Prelocking_strategy*) /data/src/10.4/sql/sql_base.cc:5147

    #13 0x55e3d2ba357c in open_and_lock_tables(THD*, TABLE_LIST*, bool, unsigned int) /data/src/10.4/sql/sql_base.h:502

    #14 0x55e3d2d76ab4 in mysql_load(THD*, sql_exchange const*, TABLE_LIST*, List<Item>&, List<Item>&, List<Item>&, enum_duplicates, bool, bool) /data/src/10.4/sql/sql_load.cc:388

    #15 0x55e3d2da61dc in mysql_execute_command(THD*) /data/src/10.4/sql/sql_parse.cc:5184

    #16 0x55e3d2db96fe in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.4/sql/sql_parse.cc:8154

    #17 0x55e3d2d9182a in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.4/sql/sql_parse.cc:1832

    #18 0x55e3d2d8e67b in do_command(THD*) /data/src/10.4/sql/sql_parse.cc:1365

    #19 0x55e3d3122479 in do_handle_one_connection(CONNECT*) /data/src/10.4/sql/sql_connect.cc:1398

    #20 0x55e3d3121e72 in handle_one_connection /data/src/10.4/sql/sql_connect.cc:1301

    #21 0x55e3d3ce9b92 in pfs_spawn_thread /data/src/10.4/storage/perfschema/pfs.cc:1862

    #22 0x7f8a8fe07493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)

previously allocated by thread T5 here:

    #0 0x7f8a9007173f in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x5473f)

    #1 0x55e3d469b711 in sf_malloc /data/src/10.4/mysys/safemalloc.c:118

    #2 0x55e3d466c00c in my_malloc /data/src/10.4/mysys/my_malloc.c:101

    #3 0x55e3d466d07d in my_strndup /data/src/10.4/mysys/my_malloc.c:256

    #4 0x55e3d2cd1b4d in mysql_change_db(THD*, st_mysql_const_lex_string const*, bool) /data/src/10.4/sql/sql_db.cc:1502

    #5 0x55e3d2c0c3a2 in acl_authenticate(THD*, unsigned int) /data/src/10.4/sql/sql_acl.cc:13966

    #6 0x55e3d3120d0a in check_connection /data/src/10.4/sql/sql_connect.cc:1075

    #7 0x55e3d31210b4 in login_connection(THD*) /data/src/10.4/sql/sql_connect.cc:1144

    #8 0x55e3d3121e9d in thd_prepare_connection(THD*) /data/src/10.4/sql/sql_connect.cc:1309

    #9 0x55e3d3122446 in do_handle_one_connection(CONNECT*) /data/src/10.4/sql/sql_connect.cc:1386

    #10 0x55e3d3121e72 in handle_one_connection /data/src/10.4/sql/sql_connect.cc:1301

    #11 0x55e3d3ce9b92 in pfs_spawn_thread /data/src/10.4/storage/perfschema/pfs.cc:1862

    #12 0x7f8a8fe07493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)

Thread T5 created by T0 here:

    #0 0x7f8a90040bba in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23bba)

    #1 0x55e3d3cea15a in spawn_thread_v1 /data/src/10.4/storage/perfschema/pfs.cc:1912

    #2 0x55e3d2ada316 in inline_mysql_thread_create /data/src/10.4/include/mysql/psi/mysql_thread.h:1268

    #3 0x55e3d2aef26d in create_thread_to_handle_connection(CONNECT*) /data/src/10.4/sql/mysqld.cc:6218

    #4 0x55e3d2aef972 in create_new_thread(CONNECT*) /data/src/10.4/sql/mysqld.cc:6288

    #5 0x55e3d2aefd02 in handle_accepted_socket(st_mysql_socket, st_mysql_socket) /data/src/10.4/sql/mysqld.cc:6386

    #6 0x55e3d2af094e in handle_connections_sockets() /data/src/10.4/sql/mysqld.cc:6544

    #7 0x55e3d2aeeaa8 in mysqld_main(int, char**) /data/src/10.4/sql/mysqld.cc:5876

    #8 0x55e3d2ad819f in main /data/src/10.4/sql/main.cc:25

    #9 0x7f8a8df0d2b0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202b0)

SUMMARY: AddressSanitizer: heap-use-after-free /data/src/10.4/strings/strxnmov.c:66 strxnmov

Shadow bytes around the buggy address:

  0x0c187fffd3a0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd

  0x0c187fffd3b0: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa

  0x0c187fffd3c0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c187fffd3d0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd

  0x0c187fffd3e0: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa

=>0x0c187fffd3f0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd[fd]fd

  0x0c187fffd400: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c187fffd410: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c187fffd420: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c187fffd430: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c187fffd440: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

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

  Heap right redzone:      fb

  Freed heap region:       fd

  Stack left redzone:      f1

  Stack mid redzone:       f2

  Stack right redzone:     f3

  Stack partial redzone:   f4

  Stack after return:      f5

  Stack use after scope:   f8

  Global redzone:          f9

  Global init order:       f6

  Poisoned by user:        f7

  Contiguous container OOB:fc

  ASan internal:           fe

==21596==ABORTING