[MDEV-17298] ASAN unknown-crash / READ of size 1 in my_strntoul_8bit upon INSERT .. SELECT Created: 2018-09-26  Updated: 2018-11-05  Resolved: 2018-10-31

Status: Closed
Project: MariaDB Server
Component/s: Data Manipulation - Insert, Server
Affects Version/s: 5.5, 10.0, 10.1, 10.2, 10.3, 10.4
Fix Version/s: 10.3.11, 10.4.0, 10.2.19, 10.1.38, 10.0.38

Type: Bug Priority: Major
Reporter: Elena Stepanova Assignee: Alexander Barkov
Resolution: Fixed Votes: 0
Labels: None


 Description   

CREATE TABLE t1 (a CHAR);
CREATE TABLE t2 (b ENUM('foo','bar'));
INSERT INTO t1 VALUES ('1');
 
INSERT INTO t2 SELECT * FROM t1;
 
# Cleanup
DROP TABLE t1, t2;

10.0 1144acbcbd ASAN debug

=================================================================
==26245==ERROR: AddressSanitizer: unknown-crash on address 0x6190000bdc0a at pc 0x1925212 bp 0x7f8af27195c0 sp 0x7f8af27195b8
READ of size 1 at 0x6190000bdc0a thread T5
    #0 0x1925211 in my_strntoul_8bit /data/src/10.0/strings/ctype-simple.c:492
    #1 0xb37db9 in Field_enum::store(char const*, unsigned int, charset_info_st const*) /data/src/10.0/sql/field.cc:8013
    #2 0xb5671a in field_conv_incompatible(Field*, Field*) /data/src/10.0/sql/field_conv.cc:948
    #3 0xb56a20 in field_conv(Field*, Field*) /data/src/10.0/sql/field_conv.cc:875
    #4 0xb9cec6 in save_field_in_field /data/src/10.0/sql/item.cc:5877
    #5 0xb9cfcd in Item_field::save_in_field(Field*, bool) /data/src/10.0/sql/item.cc:5933
    #6 0x5fdb4f in fill_record(THD*, TABLE*, Field**, List<Item>&, bool, bool) /data/src/10.0/sql/sql_base.cc:8967
    #7 0x5fdea4 in fill_record_n_invoke_before_triggers(THD*, TABLE*, Field**, List<Item>&, bool, trg_event_type) /data/src/10.0/sql/sql_base.cc:9014
    #8 0x672ce5 in select_insert::store_values(List<Item>&) /data/src/10.0/sql/sql_insert.cc:3688
    #9 0x67b69f in select_insert::send_data(List<Item>&) /data/src/10.0/sql/sql_insert.cc:3622
    #10 0x7a58c8 in end_send /data/src/10.0/sql/sql_select.cc:19123
    #11 0x79bd99 in do_select /data/src/10.0/sql/sql_select.cc:17615
    #12 0x7df26d in JOIN::exec_inner() /data/src/10.0/sql/sql_select.cc:3123
    #13 0x7e0615 in JOIN::exec() /data/src/10.0/sql/sql_select.cc:2409
    #14 0x7d5778 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/10.0/sql/sql_select.cc:3348
    #15 0x7d5da8 in handle_select(THD*, LEX*, select_result*, unsigned long) /data/src/10.0/sql/sql_select.cc:377
    #16 0x6d7896 in mysql_execute_command(THD*) /data/src/10.0/sql/sql_parse.cc:3543
    #17 0x6e4990 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/src/10.0/sql/sql_parse.cc:6637
    #18 0x6e85af in dispatch_command(enum_server_command, THD*, char*, unsigned int) /data/src/10.0/sql/sql_parse.cc:1300
    #19 0x6ecea8 in do_command(THD*) /data/src/10.0/sql/sql_parse.cc:1003
    #20 0x97cad3 in do_handle_one_connection(THD*) /data/src/10.0/sql/sql_connect.cc:1377
    #21 0x97cd3a in handle_one_connection /data/src/10.0/sql/sql_connect.cc:1292
    #22 0x11b5b34 in pfs_spawn_thread /data/src/10.0/storage/perfschema/pfs.cc:1861
    #23 0x7f8afcd2e493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)
    #24 0x7f8afb0e793e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe893e)
 
0x6190000bdc0a is located 138 bytes inside of 1100-byte region [0x6190000bdb80,0x6190000bdfcc)
allocated by thread T5 here:
    #0 0x7f8afcf9873f in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x5473f)
    #1 0x18f532f in sf_malloc /data/src/10.0/mysys/safemalloc.c:115
    #2 0x19d808a (/data/bld/10.0-asan/bin/mysqld+0x19d808a)
 
Thread T5 created by T0 here:
    #0 0x7f8afcf67bba in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23bba)
    #1 0x11c138b in spawn_thread_v1 /data/src/10.0/storage/perfschema/pfs.cc:1911
 
SUMMARY: AddressSanitizer: unknown-crash /data/src/10.0/strings/ctype-simple.c:492 my_strntoul_8bit
Shadow bytes around the buggy address:
  0x0c328000fb30: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c328000fb40: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c328000fb50: fd fd fd fd fd fd fd fd fd fd fa fa fa fa fa fa
  0x0c328000fb60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c328000fb70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c328000fb80: 00[02]02 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c328000fb90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c328000fba0: 00 00 00 00 00 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
  0x0c328000fbb0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
  0x0c328000fbc0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
  0x0c328000fbd0: 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
  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
==26245==ABORTING

Reproducible with at least MyISAM and InnoDB.
No visible effect on non-ASAN builds, but it might be the matter of luck.


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