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  1. MariaDB Server
  2. MDEV-18738

ASAN heap-use-after-free in copy_if_not_alloced / copy_fields

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      Description

      SELECT REPLACE( CAST( CURDATE() AS BINARY ), CURDATE(), REPEAT('a',32) ) AS f FROM mysql.user GROUP BY f;
      

      10.1 28cb0417

      ==3123==ERROR: AddressSanitizer: heap-use-after-free on address 0x60e000075750 at pc 0x55e95f17c4e7 bp 0x7f930d1b0a80 sp 0x7f930d1b0a78
      READ of size 10 at 0x60e000075750 thread T6
          #0 0x55e95f17c4e6 in copy_if_not_alloced(String*, String*, unsigned int) /data/src/10.1/sql/sql_string.cc:915
          #1 0x55e95f68d9f5 in Item_func_replace::val_str(String*) /data/src/10.1/sql/item_strfunc.cc:1197
          #2 0x55e95f536641 in Item_copy_string::copy() /data/src/10.1/sql/item.cc:4063
          #3 0x55e95f0c1fdb in copy_fields(TMP_TABLE_PARAM*) /data/src/10.1/sql/sql_select.cc:23163
          #4 0x55e95f0d0115 in end_send_group(JOIN*, st_join_table*, bool) /data/src/10.1/sql/sql_select.cc:19816
          #5 0x55e95f0657b2 in evaluate_join_record /data/src/10.1/sql/sql_select.cc:18702
          #6 0x55e95f0813fd in sub_select(JOIN*, st_join_table*, bool) /data/src/10.1/sql/sql_select.cc:18479
          #7 0x55e95f0ba9d0 in do_select /data/src/10.1/sql/sql_select.cc:18134
          #8 0x55e95f0ff54e in JOIN::exec_inner() /data/src/10.1/sql/sql_select.cc:3275
          #9 0x55e95f100836 in JOIN::exec() /data/src/10.1/sql/sql_select.cc:2562
          #10 0x55e95f0f5089 in mysql_select(THD*, Item***, 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/10.1/sql/sql_select.cc:3499
          #11 0x55e95f0f5877 in handle_select(THD*, LEX*, select_result*, unsigned long) /data/src/10.1/sql/sql_select.cc:388
          #12 0x55e95efc4a59 in execute_sqlcom_select /data/src/10.1/sql/sql_parse.cc:5950
          #13 0x55e95efdec69 in mysql_execute_command(THD*) /data/src/10.1/sql/sql_parse.cc:2995
          #14 0x55e95eff6e7a in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/src/10.1/sql/sql_parse.cc:7468
          #15 0x55e95effdc5e in dispatch_command(enum_server_command, THD*, char*, unsigned int) /data/src/10.1/sql/sql_parse.cc:1496
          #16 0x55e95f0043ea in do_command(THD*) /data/src/10.1/sql/sql_parse.cc:1124
          #17 0x55e95f2ac8bf in do_handle_one_connection(THD*) /data/src/10.1/sql/sql_connect.cc:1330
          #18 0x55e95f2acdd0 in handle_one_connection /data/src/10.1/sql/sql_connect.cc:1242
          #19 0x55e95fb7bccc in pfs_spawn_thread /data/src/10.1/storage/perfschema/pfs.cc:1861
          #20 0x7f93198e7493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)
          #21 0x7f9317ca093e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe893e)
       
      0x60e000075750 is located 112 bytes inside of 148-byte region [0x60e0000756e0,0x60e000075774)
      freed by thread T6 here:
          #0 0x7f9319b51527 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x54527)
          #1 0x55e9603480e1 in free_memory /data/src/10.1/mysys/safemalloc.c:276
       
      previously allocated by thread T6 here:
          #0 0x7f9319b5173f in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x5473f)
          #1 0x55e9603481b2 in sf_malloc /data/src/10.1/mysys/safemalloc.c:115
          #2 0x55e960440c1a (/data/bld/10.1-asan/bin/mysqld+0x1d9ec1a)
       
      Thread T6 created by T0 here:
          #0 0x7f9319b20bba in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23bba)
          #1 0x55e95fb87523 in spawn_thread_v1 /data/src/10.1/storage/perfschema/pfs.cc:1911
       
      SUMMARY: AddressSanitizer: heap-use-after-free /data/src/10.1/sql/sql_string.cc:915 copy_if_not_alloced(String*, String*, unsigned int)
      Shadow bytes around the buggy address:
        0x0c1c80006a90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
        0x0c1c80006aa0: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
        0x0c1c80006ab0: 00 00 00 00 00 00 00 04 fa fa fa fa fa fa fa fa
        0x0c1c80006ac0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        0x0c1c80006ad0: 00 00 04 fa fa fa fa fa fa fa fa fa fd fd fd fd
      =>0x0c1c80006ae0: fd fd fd fd fd fd fd fd fd fd[fd]fd fd fd fd fa
        0x0c1c80006af0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
        0x0c1c80006b00: 00 00 00 00 00 00 00 00 00 00 02 04 fa fa fa fa
        0x0c1c80006b10: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
        0x0c1c80006b20: 00 00 00 00 00 01 04 fa fa fa fa fa fa fa fa fa
        0x0c1c80006b30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
      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
      ==3123==ABORTING
      

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              • Assignee:
                bar Alexander Barkov
                Reporter:
                elenst Elena Stepanova
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                • Created:
                  Updated:
                  Resolved: