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crash in string-to-int conversion

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using a specially crafted strings one could overflow `shift`
variable and cause a crash by dereferencing d10[-2147483648]
(on a sufficiently old gcc).

This is a correct fix and a test case for

Bug #29723340: MYSQL SERVER CRASH AFTER SQL QUERY WITH DATA ?AST
This commit is contained in:
Sergei Golubchik 2019-10-19 09:32:11 +02:00
parent 412e3e6917
commit 719ac0ad4a
3 changed files with 79 additions and 4 deletions
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40
mysql-test/r/func_math.result
View file

@ -829,5 +829,45 @@ t1 CREATE TABLE `t1` (
) ENGINE=MyISAM DEFAULT CHARSET=latin1
DROP TABLE t1;
#
# Bug #29723340: MYSQL SERVER CRASH AFTER SQL QUERY WITH DATA ?AST
#
create table t1(a int);
insert t1 values("1e-214748364");
Warnings:
Warning 1265 Data truncated for column 'a' at row 1
insert t1 values("1e-2147483648");
Warnings:
Warning 1265 Data truncated for column 'a' at row 1
insert t1 values("1e-21474836480");
Warnings:
Warning 1265 Data truncated for column 'a' at row 1
insert t1 values("1e+214748364");
Warnings:
Warning 1264 Out of range value for column 'a' at row 1
insert t1 values("1e+2147483647");
Warnings:
Warning 1264 Out of range value for column 'a' at row 1
insert t1 values("1e+21474836470");
Warnings:
Warning 1264 Out of range value for column 'a' at row 1
set global max_allowed_packet= cast(2*1024*1024*1024+1024 as unsigned);
Warnings:
Warning 1292 Truncated incorrect max_allowed_packet value: '2147484672'
set @a=2147483647;
insert t1 values (concat('1', repeat('0', @a+18), 'e-', @a-1, '0'));
Warnings:
Warning 1301 Result of repeat() was larger than max_allowed_packet (1073741824) - truncated
set global max_allowed_packet=default;
select * from t1;
a
0
0
0
2147483647
2147483647
2147483647
NULL
drop table t1;
#
# End of 5.5 tests
#

25
mysql-test/t/func_math.test
View file

@ -614,6 +614,31 @@ SHOW CREATE TABLE t1;
DROP TABLE t1;
--echo #
--echo # Bug #29723340: MYSQL SERVER CRASH AFTER SQL QUERY WITH DATA ?AST
--echo #
create table t1(a int);
insert t1 values("1e-214748364");
insert t1 values("1e-2147483648");
insert t1 values("1e-21474836480");
insert t1 values("1e+214748364");
insert t1 values("1e+2147483647");
insert t1 values("1e+21474836470");
# if max max_allowed_packet will ever be increased beyond 2GB, this could
# break again:
set global max_allowed_packet= cast(2*1024*1024*1024+1024 as unsigned);
connect foo,localhost,root;
set @a=2147483647;
insert t1 values (concat('1', repeat('0', @a+18), 'e-', @a-1, '0'));
disconnect foo;
connection default;
set global max_allowed_packet=default;
select * from t1;
drop table t1;
--echo #
--echo # End of 5.5 tests
--echo #

18
strings/ctype-simple.c
View file

@ -1,5 +1,5 @@
/* Copyright (c) 2002, 2013, Oracle and/or its affiliates.
Copyright (c) 2009, 2014, SkySQL Ab.
Copyright (c) 2009, 2019, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -1524,10 +1524,20 @@ exp: /* [ E [ <sign> ] <unsigned integer> ] */
if (++str == end)
goto ret_sign;
}
for (exponent= 0 ;
str < end && (ch= (uchar) (*str - '0')) < 10;
str++)
if (shift > 0 && !negative_exp)
goto ret_too_big;
for (exponent= 0 ; str < end && (ch= (uchar) (*str - '0')) < 10; str++)
{
if (negative_exp)
{
if (exponent - shift > DIGITS_IN_ULONGLONG)
goto ret_zero;
}
else
{
if (exponent + shift > DIGITS_IN_ULONGLONG)
goto ret_too_big;
}
exponent= exponent * 10 + ch;
}
shift+= negative_exp ? -exponent : exponent;