ASAN heap-use-after-free in Field_blob::cmp_binary upon multi-update or replace on table with unique blob

CREATE TABLE t1 (a varchar(8) CHARACTER SET utf8);

INSERT INTO t1 VALUES ('foo'),('bar');

CREATE TABLE t2 (f TEXT UNIQUE);

INSERT INTO t2 VALUES ('qux');

UPDATE t1 JOIN t2 SET f = a;

# Cleanup

DROP TABLE t1, t2;

==12750==ERROR: AddressSanitizer: heap-use-after-free on address 0x60c000027bf0 at pc 0x7f71c8a13238 bp 0x7f71bdb10d40 sp 0x7f71bdb104f0

READ of size 3 at 0x60c000027bf0 thread T5

    #0 0x7f71c8a13237  (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x8d237)

    #1 0x56347f451893 in Field_blob::cmp_binary(unsigned char const*, unsigned char const*, unsigned int) /data/src/10.4/sql/field.cc:8539

    #2 0x56347f46c7b7 in Field::cmp_binary_offset(unsigned int) /data/src/10.4/sql/field.h:1100

    #3 0x56347efb3c87 in compare_record(TABLE const*) /data/src/10.4/sql/sql_update.cc:119

    #4 0x56347efc5450 in multi_update::send_data(List<Item>&) /data/src/10.4/sql/sql_update.cc:2504

    #5 0x56347ee68fbd in end_send /data/src/10.4/sql/sql_select.cc:21555

    #6 0x56347ee61958 in evaluate_join_record /data/src/10.4/sql/sql_select.cc:20586

    #7 0x56347ee60bd8 in sub_select(JOIN*, st_join_table*, bool) /data/src/10.4/sql/sql_select.cc:20405

    #8 0x56347ee5e95e in do_select /data/src/10.4/sql/sql_select.cc:19904

    #9 0x56347edf772d in JOIN::exec_inner() /data/src/10.4/sql/sql_select.cc:4459

    #10 0x56347edf5039 in JOIN::exec() /data/src/10.4/sql/sql_select.cc:4241

    #11 0x56347edf8aeb in mysql_select(THD*, 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*) /data/src/10.4/sql/sql_select.cc:4673

    #12 0x56347efbfc3d in mysql_multi_update(THD*, TABLE_LIST*, List<Item>*, List<Item>*, Item*, unsigned long long, enum_duplicates, bool, st_select_lex_unit*, st_select_lex*, multi_update**) /data/src/10.4/sql/sql_update.cc:1927

    #13 0x56347ed43153 in mysql_execute_command(THD*) /data/src/10.4/sql/sql_parse.cc:4445

    #14 0x56347ed59258 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.4/sql/sql_parse.cc:7900

    #15 0x56347ed342a3 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.4/sql/sql_parse.cc:1842

    #16 0x56347ed31281 in do_command(THD*) /data/src/10.4/sql/sql_parse.cc:1360

    #17 0x56347f0b6781 in do_handle_one_connection(CONNECT*) /data/src/10.4/sql/sql_connect.cc:1412

    #18 0x56347f0b6135 in handle_one_connection /data/src/10.4/sql/sql_connect.cc:1316

    #19 0x56348051411b in pfs_spawn_thread /data/src/10.4/storage/perfschema/pfs.cc:1869

    #20 0x7f71c87704a3 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x74a3)

    #21 0x7f71c68a4d0e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe8d0e)

0x60c000027bf0 is located 112 bytes inside of 124-byte region [0x60c000027b80,0x60c000027bfc)

freed by thread T5 here:

    #0 0x7f71c8a47a10 in free (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc1a10)

    #1 0x5634806473ca in free_memory /data/src/10.4/mysys/safemalloc.c:279

    #2 0x563480646a6c in sf_free /data/src/10.4/mysys/safemalloc.c:197

    #3 0x563480618974 in my_free /data/src/10.4/mysys/my_malloc.c:222

    #4 0x56347eaabfa5 in Binary_string::free() /data/src/10.4/sql/sql_string.h:608

    #5 0x56347eae9ed3 in Binary_string::set(char const*, unsigned long) /data/src/10.4/sql/sql_string.h:466

    #6 0x56347eae9f20 in String::set(char const*, unsigned long, charset_info_st const*) /data/src/10.4/sql/sql_string.h:767

    #7 0x56347f44a577 in Field_varstring::val_str(String*, String*) /data/src/10.4/sql/field.cc:7692

    #8 0x56347eacb627 in Field::val_str(String*) /data/src/10.4/sql/field.h:854

    #9 0x56347f475e22 in Field_blob::store_field(Field*) /data/src/10.4/sql/field.h:3925

    #10 0x56347f4839dd in field_conv_incompatible /data/src/10.4/sql/field_conv.cc:851

    #11 0x56347f483a7a in field_conv(Field*, Field*) /data/src/10.4/sql/field_conv.cc:862

    #12 0x56347f50f602 in save_field_in_field /data/src/10.4/sql/item.cc:6438

    #13 0x56347f50fc62 in Item_field::save_in_field(Field*, bool) /data/src/10.4/sql/item.cc:6489

    #14 0x56347ebf4927 in fill_record(THD*, TABLE*, List<Item>&, List<Item>&, bool, bool) /data/src/10.4/sql/sql_base.cc:8482

    #15 0x56347ebf5a58 in fill_record_n_invoke_before_triggers(THD*, TABLE*, List<Item>&, List<Item>&, bool, trg_event_type) /data/src/10.4/sql/sql_base.cc:8654

    #16 0x56347efc5390 in multi_update::send_data(List<Item>&) /data/src/10.4/sql/sql_update.cc:2493

    #17 0x56347ee68fbd in end_send /data/src/10.4/sql/sql_select.cc:21555

    #18 0x56347ee61958 in evaluate_join_record /data/src/10.4/sql/sql_select.cc:20586

    #19 0x56347ee60bd8 in sub_select(JOIN*, st_join_table*, bool) /data/src/10.4/sql/sql_select.cc:20405

    #20 0x56347ee5e95e in do_select /data/src/10.4/sql/sql_select.cc:19904

    #21 0x56347edf772d in JOIN::exec_inner() /data/src/10.4/sql/sql_select.cc:4459

    #22 0x56347edf5039 in JOIN::exec() /data/src/10.4/sql/sql_select.cc:4241

    #23 0x56347edf8aeb in mysql_select(THD*, 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*) /data/src/10.4/sql/sql_select.cc:4673

    #24 0x56347efbfc3d in mysql_multi_update(THD*, TABLE_LIST*, List<Item>*, List<Item>*, Item*, unsigned long long, enum_duplicates, bool, st_select_lex_unit*, st_select_lex*, multi_update**) /data/src/10.4/sql/sql_update.cc:1927

    #25 0x56347ed43153 in mysql_execute_command(THD*) /data/src/10.4/sql/sql_parse.cc:4445

    #26 0x56347ed59258 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.4/sql/sql_parse.cc:7900

    #27 0x56347ed342a3 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.4/sql/sql_parse.cc:1842

    #28 0x56347ed31281 in do_command(THD*) /data/src/10.4/sql/sql_parse.cc:1360

    #29 0x56347f0b6781 in do_handle_one_connection(CONNECT*) /data/src/10.4/sql/sql_connect.cc:1412

previously allocated by thread T5 here:

    #0 0x7f71c8a47d28 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc1d28)

    #1 0x56348064646c in sf_malloc /data/src/10.4/mysys/safemalloc.c:118

    #2 0x56348061806b in my_malloc /data/src/10.4/mysys/my_malloc.c:101

    #3 0x56347ef2da05 in Binary_string::real_alloc(unsigned long) /data/src/10.4/sql/sql_string.cc:44

    #4 0x56347eac995f in Binary_string::alloc(unsigned long) /data/src/10.4/sql/sql_string.h:617

    #5 0x56347f44ff9e in Field_blob::store(char const*, unsigned long, charset_info_st const*) /data/src/10.4/sql/field.cc:8411

    #6 0x56347f476010 in Field_blob::store_field(Field*) /data/src/10.4/sql/field.h:3929

    #7 0x56347f4839dd in field_conv_incompatible /data/src/10.4/sql/field_conv.cc:851

    #8 0x56347f483a7a in field_conv(Field*, Field*) /data/src/10.4/sql/field_conv.cc:862

    #9 0x56347f50f602 in save_field_in_field /data/src/10.4/sql/item.cc:6438

    #10 0x56347f50fc62 in Item_field::save_in_field(Field*, bool) /data/src/10.4/sql/item.cc:6489

    #11 0x56347ebf4927 in fill_record(THD*, TABLE*, List<Item>&, List<Item>&, bool, bool) /data/src/10.4/sql/sql_base.cc:8482

    #12 0x56347ebf5a58 in fill_record_n_invoke_before_triggers(THD*, TABLE*, List<Item>&, List<Item>&, bool, trg_event_type) /data/src/10.4/sql/sql_base.cc:8654

    #13 0x56347efc5390 in multi_update::send_data(List<Item>&) /data/src/10.4/sql/sql_update.cc:2493

    #14 0x56347ee68fbd in end_send /data/src/10.4/sql/sql_select.cc:21555

    #15 0x56347ee61958 in evaluate_join_record /data/src/10.4/sql/sql_select.cc:20586

    #16 0x56347ee60575 in sub_select(JOIN*, st_join_table*, bool) /data/src/10.4/sql/sql_select.cc:20366

    #17 0x56347ee5e95e in do_select /data/src/10.4/sql/sql_select.cc:19904

    #18 0x56347edf772d in JOIN::exec_inner() /data/src/10.4/sql/sql_select.cc:4459

    #19 0x56347edf5039 in JOIN::exec() /data/src/10.4/sql/sql_select.cc:4241

    #20 0x56347edf8aeb in mysql_select(THD*, 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*) /data/src/10.4/sql/sql_select.cc:4673

    #21 0x56347efbfc3d in mysql_multi_update(THD*, TABLE_LIST*, List<Item>*, List<Item>*, Item*, unsigned long long, enum_duplicates, bool, st_select_lex_unit*, st_select_lex*, multi_update**) /data/src/10.4/sql/sql_update.cc:1927

    #22 0x56347ed43153 in mysql_execute_command(THD*) /data/src/10.4/sql/sql_parse.cc:4445

    #23 0x56347ed59258 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.4/sql/sql_parse.cc:7900

    #24 0x56347ed342a3 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.4/sql/sql_parse.cc:1842

    #25 0x56347ed31281 in do_command(THD*) /data/src/10.4/sql/sql_parse.cc:1360

    #26 0x56347f0b6781 in do_handle_one_connection(CONNECT*) /data/src/10.4/sql/sql_connect.cc:1412

    #27 0x56347f0b6135 in handle_one_connection /data/src/10.4/sql/sql_connect.cc:1316

    #28 0x56348051411b in pfs_spawn_thread /data/src/10.4/storage/perfschema/pfs.cc:1869

    #29 0x7f71c87704a3 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x74a3)

Thread T5 created by T0 here:

    #0 0x7f71c89b6f59 in __interceptor_pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x30f59)

    #1 0x563480514508 in spawn_thread_v1 /data/src/10.4/storage/perfschema/pfs.cc:1919

    #2 0x56347ea8b5d8 in inline_mysql_thread_create /data/src/10.4/include/mysql/psi/mysql_thread.h:1275

    #3 0x56347ea9fa71 in create_thread_to_handle_connection(CONNECT*) /data/src/10.4/sql/mysqld.cc:6259

    #4 0x56347eaa0154 in create_new_thread(CONNECT*) /data/src/10.4/sql/mysqld.cc:6329

    #5 0x56347eaa04df in handle_accepted_socket(st_mysql_socket, st_mysql_socket) /data/src/10.4/sql/mysqld.cc:6427

    #6 0x56347eaa1131 in handle_connections_sockets() /data/src/10.4/sql/mysqld.cc:6585

    #7 0x56347ea9f2d3 in mysqld_main(int, char**) /data/src/10.4/sql/mysqld.cc:5917

    #8 0x56347ea894bf in main /data/src/10.4/sql/main.cc:25

    #9 0x7f71c67dc2e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0)

SUMMARY: AddressSanitizer: heap-use-after-free (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x8d237) 

Shadow bytes around the buggy address:

  0x0c187fffcf20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c187fffcf30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c187fffcf40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c187fffcf50: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00

  0x0c187fffcf60: 00 00 00 00 00 00 00 04 fa fa fa fa fa fa fa fa

=>0x0c187fffcf70: fd fd fd fd fd fd fd fd fd fd fd fd fd fd[fd]fd

  0x0c187fffcf80: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd

  0x0c187fffcf90: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa

  0x0c187fffcfa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04

  0x0c187fffcfb0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd

  0x0c187fffcfc0: fd fd fd fd fd fd fd fd 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

  Container overflow:      fc

  Array cookie:            ac

  Intra object redzone:    bb

  ASan internal:           fe

  Left alloca redzone:     ca

  Right alloca redzone:    cb

==12750==ABORTING