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Gh18976 #18977

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2 changes: 1 addition & 1 deletion ext/standard/pack.c
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Original file line number Diff line number Diff line change
Expand Up @@ -388,7 +388,7 @@ PHP_FUNCTION(pack)
switch ((int) code) {
case 'h':
case 'H':
INC_OUTPUTPOS((arg + (arg % 2)) / 2,1) /* 4 bit per arg */
INC_OUTPUTPOS((arg / 2) + (arg % 2),1) /* 4 bit per arg */
break;

case 'a':
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14 changes: 14 additions & 0 deletions ext/standard/tests/strings/gh18976.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
--TEST--
GH-18976 (pack overflow with h/H format)
--INI--
memory_limit=-1
--FILE--
<?php
pack('h2147483647', 1);
pack('H2147483647', 1);
?>
--EXPECTF--

Warning: pack(): Type h: not enough characters in string in %s on line %d

Warning: pack(): Type H: not enough characters in string in %s on line %d
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