ASAN heap-use-after-free in make_date_time / Arg_comparator::compare_string / Item_func_nullif::compare

SELECT NULLIF( 'foo', FROM_UNIXTIME( '2012-12-12 12:12:12', TRIM( 0 ) ) );

==23977==ERROR: AddressSanitizer: heap-use-after-free on address 0x60d000032920 at pc 0x55619e1d755c bp 0x7fa61270d6a0 sp 0x7fa61270d698

READ of size 1 at 0x60d000032920 thread T6

    #0 0x55619e1d755b in make_date_time /data/src/10.1/sql/item_timefunc.cc:475

    #1 0x55619e1d755b in Item_func_date_format::val_str(String*) /data/src/10.1/sql/item_timefunc.cc:1986

    #2 0x55619e04d7b6 in Arg_comparator::compare_string() /data/src/10.1/sql/item_cmpfunc.cc:850

    #3 0x55619e0564e2 in Arg_comparator::compare() /data/src/10.1/sql/item_cmpfunc.h:87

    #4 0x55619e0564e2 in Item_func_nullif::compare() /data/src/10.1/sql/item_cmpfunc.cc:2904

    #5 0x55619e0568a4 in Item_func_nullif::str_op(String*) /data/src/10.1/sql/item_cmpfunc.cc:2952

    #6 0x55619e0de517 in Item_func_hybrid_field_type::str_op_with_null_check(String*) /data/src/10.1/sql/item_func.h:453

    #7 0x55619e0de517 in Item_func_hybrid_field_type::val_str(String*) /data/src/10.1/sql/item_func.cc:878

    #8 0x55619dfd1228 in Item::send(Protocol*, String*) /data/src/10.1/sql/item.cc:6392

    #9 0x55619d8deb14 in Protocol::send_result_set_row(List<Item>*) /data/src/10.1/sql/protocol.cc:914

    #10 0x55619d9e8ac9 in select_send::send_data(List<Item>&) /data/src/10.1/sql/sql_class.cc:2748

    #11 0x55619db974b9 in JOIN::exec_inner() /data/src/10.1/sql/sql_select.cc:2641

    #12 0x55619dba080c in JOIN::exec() /data/src/10.1/sql/sql_select.cc:2562

    #13 0x55619db9505f 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

    #14 0x55619db9584d in handle_select(THD*, LEX*, select_result*, unsigned long) /data/src/10.1/sql/sql_select.cc:388

    #15 0x55619da64a2f in execute_sqlcom_select /data/src/10.1/sql/sql_parse.cc:5950

    #16 0x55619da7ec3f in mysql_execute_command(THD*) /data/src/10.1/sql/sql_parse.cc:2995

    #17 0x55619da96e50 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/src/10.1/sql/sql_parse.cc:7468

    #18 0x55619da9dc34 in dispatch_command(enum_server_command, THD*, char*, unsigned int) /data/src/10.1/sql/sql_parse.cc:1496

    #19 0x55619daa43c0 in do_command(THD*) /data/src/10.1/sql/sql_parse.cc:1124

    #20 0x55619dd4c895 in do_handle_one_connection(THD*) /data/src/10.1/sql/sql_connect.cc:1330

    #21 0x55619dd4cda6 in handle_one_connection /data/src/10.1/sql/sql_connect.cc:1242

    #22 0x55619e61bca2 in pfs_spawn_thread /data/src/10.1/storage/perfschema/pfs.cc:1861

    #23 0x7fa61ee6b493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)

    #24 0x7fa61d22493e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe893e)

0x60d000032920 is located 112 bytes inside of 140-byte region [0x60d0000328b0,0x60d00003293c)

freed by thread T6 here:

    #0 0x7fa61f0d5527 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x54527)

    #1 0x55619ede7b2d in free_memory /data/src/10.1/mysys/safemalloc.c:276

previously allocated by thread T6 here:

    #0 0x7fa61f0d573f in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x5473f)

    #1 0x55619ede7bfe in sf_malloc /data/src/10.1/mysys/safemalloc.c:115

    #2 0x55619eee065a (/data/bld/10.1-asan/bin/mysqld+0x1d9e65a)

Thread T6 created by T0 here:

    #0 0x7fa61f0a4bba in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23bba)

    #1 0x55619e6274f9 in spawn_thread_v1 /data/src/10.1/storage/perfschema/pfs.cc:1911

SUMMARY: AddressSanitizer: heap-use-after-free /data/src/10.1/sql/item_timefunc.cc:475 make_date_time

Shadow bytes around the buggy address:

  0x0c1a7fffe4d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c1a7fffe4e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c1a7fffe4f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c1a7fffe500: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c1a7fffe510: fa fa fa fa fa fa fd fd fd fd fd fd fd fd fd fd

=>0x0c1a7fffe520: fd fd fd fd[fd]fd fd fd fa fa fa fa fa fa fa fa

  0x0c1a7fffe530: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c1a7fffe540: fd fd fa fa fa fa fa fa fa fa fd fd fd fd fd fd

  0x0c1a7fffe550: fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa fa

  0x0c1a7fffe560: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c1a7fffe570: fd fd fd fd fd fd fa fa fa fa fa fa fa fa fd fd

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

==23977==ABORTING