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backport to 5.1 from 6.0

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Bug#35658 (An empty binary value leads to mysqld crash)
  
Before this fix, the following token
  b''
caused the parser to crash when reading the binary value from the empty string.
The crash was caused by:
  ptr+= max_length - 1;
because max_length is unsigned and was 0, causing an overflow.
  
With this fix, an empty binary literal b'' is parsed as a binary value 0,
in Item_bin_string.
This commit is contained in:
Gleb Shchepa
2008-06-27 15:23:40 +05:00
parent 81e7bd8679
commit c896190892
3 changed files with 77 additions and 11 deletions
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31
mysql-test/r/varbinary.result
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@ -95,3 +95,34 @@ table_28127_b CREATE TABLE `table_28127_b` (
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table table_28127_a;
drop table table_28127_b;
select 0b01000001;
0b01000001
A
select 0x41;
0x41
A
select b'01000001';
b'01000001'
A
select x'41', 0+x'41';
x'41' 0+x'41'
A 65
select N'abc', length(N'abc');
abc length(N'abc')
abc 3
select N'', length(N'');
length(N'')
0
select '', length('');
length('')
0
select b'', 0+b'';
b'' 0+b''
0
select x'', 0+x'';
x'' 0+x''
0
select 0x;
ERROR 42S22: Unknown column '0x' in 'field list'
select 0b;
ERROR 42S22: Unknown column '0b' in 'field list'