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Fix GH-16523: FILTER_FLAG_HOSTNAME accepts ending hyphen #16540

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Fix GH-16523: FILTER_FLAG_HOSTNAME accepts ending hyphen #16540

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2 changes: 1 addition & 1 deletion ext/filter/logical_filters.c
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Original file line number Diff line number Diff line change
Expand Up @@ -542,7 +542,7 @@ static int _php_filter_validate_domain(char * domain, size_t len, zend_long flag
/* Reset label length counter */
i = 1;
} else {
if (i > 63 || (hostname && *s != '-' && !isalnum((int)*(unsigned char *)s))) {
if (i > 63 || (hostname && (*s != '-' || *(s + 1) == '\0') && !isalnum((int)*(unsigned char *)s))) {
return 0;
}

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20 changes: 20 additions & 0 deletions ext/filter/tests/gh16523.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
--TEST--
GH-16523 (FILTER_FLAG_HOSTNAME accepts ending hyphen)
--EXTENSIONS--
filter
--FILE--
<?php
$domains = [
'a-.bc.com',
'a.bc-.com',
'a.bc.com-',
];

foreach ($domains as $domain) {
var_dump(filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME));
}
?>
--EXPECT--
bool(false)
bool(false)
bool(false)
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