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Fix GH-18901: integer overflow mb_split #18906

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Fix GH-18901: integer overflow mb_split #18906

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2 changes: 1 addition & 1 deletion ext/mbstring/php_mbregex.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1184,7 +1184,7 @@ PHP_FUNCTION(mb_split)
size_t string_len;

int err;
zend_long count = -1;
zend_ulong count = -1; /* unsigned, it's a limit and we want to prevent signed overflow */

if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|l", &arg_pattern, &arg_pattern_len, &string, &string_len, &count) == FAILURE) {
RETURN_THROWS();
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54 changes: 54 additions & 0 deletions ext/mbstring/tests/gh18901.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,54 @@
--TEST--
GH-18901 (integer overflow mb_split)
--EXTENSIONS--
mbstring
--SKIPIF--
<?php
if (!function_exists('mb_split')) die('skip mb_split() not available');
?>
--FILE--
<?php
$vals = [PHP_INT_MIN, PHP_INT_MAX, -1, 0, 1];
foreach ($vals as $val) {
var_dump(mb_split('\d', '123', $val));
}
?>
--EXPECT--
array(4) {
[0]=>
string(0) ""
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(0) ""
}
array(4) {
[0]=>
string(0) ""
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(0) ""
}
array(4) {
[0]=>
string(0) ""
[1]=>
string(0) ""
[2]=>
string(0) ""
[3]=>
string(0) ""
}
array(1) {
[0]=>
string(3) "123"
}
array(1) {
[0]=>
string(3) "123"
}
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