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[2007-12-17 08:14 UTC] dmitriy dot buldakov at toatech dot com
Description:
------------
php converts numerical string in array keys to integer if possible.
php4 converts those string while unserialize as well as while array processing of php code
php5 converts those string while array processing of php code only, and not converts while the unserialize a string
As the result - unserialized array can contains fake elements.
For example - there is no way to get access to the element by a key.
Reproduce code:
---------------
<?php
$a = unserialize('a:2:{s:2:"10";i:1;s:2:"01";i:2;}');
print $a['10']."\n";
$a['10'] = 3;
$a['01'] = 4;
print_r($a);
foreach ($a as $k => $v)
{
print 'KEY: ';
var_dump($k);
print 'VAL: ';
var_dump($v);
print "\n";
}
?>
Expected result:
----------------
Dmitriy-Buldakov:~ dmitry$ php4 test.php
1
Array
(
[10] => 3
[01] => 4
)
KEY: int(10)
VAL: int(3)
KEY: string(2) "01"
VAL: int(4)
Dmitriy-Buldakov:~ dmitry$
Actual result:
--------------
Dmitriy-Buldakov:~ dmitry$ php5 test.php
PHP Notice: Undefined index: 10 in /Users/dmitry/test.php on line 5
Notice: Undefined index: 10 in /Users/dmitry/test.php on line 5
Array
(
[10] => 1
[01] => 4
[10] => 3
)
KEY: string(2) "10"
VAL: int(1)
KEY: string(2) "01"
VAL: int(4)
KEY: int(10)
VAL: int(3)
Dmitriy-Buldakov:~ dmitry$
PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Thu Nov 21 08:01:29 2024 UTC |
Hmm, ok, arbitray string... Simple solution: Index: var_unserializer.c =================================================================== RCS file: /repository/php-src/ext/standard/var_unserializer.c,v retrieving revision 1.70.2.4.2.7.2.3 diff -u -u -r1.70.2.4.2.7.2.3 var_unserializer.c --- var_unserializer.c 17 Oct 2007 10:36:33 -0000 1.70.2.4.2.7.2.3 +++ var_unserializer.c 17 Dec 2007 11:58:43 -0000 @@ -282,6 +282,10 @@ return 0; } + if (Z_TYPE_P(key) == IS_STRING && strspn(Z_STRVAL_P(key), "0123456789") == Z_STRLEN_P(key)) { + convert_to_long(key); + } + switch (Z_TYPE_P(key)) { case IS_LONG: if (zend_hash_index_find(ht, Z_LVAL_P(key), (void **)&old_data)==SUCCESS) {Looks like the simple solution is not very good. As far as I understood the patch just convert any numeric string to long. It is not right way because: 1) it dose not make range check ("9999999999" is converted to 2147483647) 2) it dose not recognize negative values ("-10" is not converted to string) 3) it ignores leading zero ("01" to 1) For example, the reproduce code result is still not expected: 1 Array ( [10] => 3 [1] => 2 [01] => 4 ) KEY: int(10) VAL: int(3) KEY: int(1) VAL: int(2) KEY: string(2) "01" VAL: int(4)The following code works well switch (Z_TYPE_P(key)) { case IS_LONG: zend_hash_index_update(ht, Z_LVAL_P(key), &data, sizeof(data), NULL); break; case IS_STRING: zend_symtable_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data, sizeof(data), NULL); break; } but looks like still there is a problem here. compearing var_unserialize.c with array.c you can see that key array.c uses more sufficient key preparation. So, about the code - what should I do to put the code into repository?--- var_unserializer.c.orig 2007-12-18 12:13:16.000000000 +0200 +++ var_unserializer.c 2007-12-18 15:40:22.000000000 +0200 @@ -282,16 +282,10 @@ static inline int process_nested_data(UN switch (Z_TYPE_P(key)) { case IS_LONG: - if (zend_hash_index_find(ht, Z_LVAL_P(key), (void **)&old_data)==SUCCESS) { - var_push_dtor(var_hash, old_data); - } zend_hash_index_update(ht, Z_LVAL_P(key), &data, sizeof(data), NULL); break; case IS_STRING: - if (zend_hash_find(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, (void **)&old_data)==SUCCESS) { - var_push_dtor(var_hash, old_data); - } - zend_hash_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data, sizeof(data), NULL); + zend_symtable_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data, sizeof(data), NULL); break; }No, it works fine with '0'. I improved the code and test now. Results: array(1) { [999999999]=> int(1) } array(1) { ["9999999999"]=> int(1) } array(1) { ["+1"]=> int(1) } array(1) { [11]=> int(1) } array(1) { ["00"]=> int(1) } array(1) { [0]=> int(1) } array(1) { ["-0"]=> int(1) } array(1) { ["-01"]=> int(1) } array(1) { [-10]=> int(1) }final version of the patch --- var_unserializer.c 2007-12-18 16:11:48.000000000 +0200 +++ var_unserializer.c.old 2007-12-18 16:11:32.000000000 +0200 @@ -288,10 +288,10 @@ static inline int process_nested_data(UN zend_hash_index_update(ht, Z_LVAL_P(key), &data, sizeof(data), NULL); break; case IS_STRING: - if (zend_hash_find(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, (void **)&old_data)==SUCCESS) { + if (zend_symtable_find(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, (void **)&old_data)==SUCCESS) { var_push_dtor(var_hash, old_data); } - zend_hash_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data, sizeof(data), NULL); + zend_symtable_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data, sizeof(data), NULL); break; }Felipe, yes, you are right, yours code works good with "0" but still have problem with leading spaces. I mean that unserialize with yours patch converts string(" 9") to int(9).