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Fix GH-17518: offset overflow phar extractTo() #17519

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Fix GH-17518: offset overflow phar extractTo() #17519

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2 changes: 1 addition & 1 deletion ext/phar/phar_object.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4306,7 +4306,7 @@ static int extract_helper(phar_archive_data *archive, zend_string *search, char
if (FAILURE == phar_extract_file(overwrite, entry, pathto, pathto_len, error)) return -1;
extracted++;
} ZEND_HASH_FOREACH_END();
} else if ('/' == ZSTR_VAL(search)[ZSTR_LEN(search) - 1]) {
} else if (ZSTR_LEN(search) > 0 && '/' == ZSTR_VAL(search)[ZSTR_LEN(search) - 1]) {
/* ends in "/" -- extract all entries having that prefix */
ZEND_HASH_MAP_FOREACH_PTR(&archive->manifest, entry) {
if (0 != strncmp(ZSTR_VAL(search), entry->filename, ZSTR_LEN(search))) continue;
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23 changes: 23 additions & 0 deletions ext/phar/tests/gh17518.phpt
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@@ -0,0 +1,23 @@
--TEST--
GH-17518 (offset overflow phar extractTo())
--EXTENSIONS--
phar
--INI--
phar.readonly=0
--FILE--
<?php
$fname = __DIR__.'/gh17518.phar.php';
$phar = new Phar($fname);
$phar['a'] = 'b';
try {
$phar->extractTo(__DIR__ . '/gh17518', '');
} catch (Throwable $e) {
echo $e::class, ": ", $e->getMessage(), "\n";
}
?>
--CLEAN--
<?php
@unlink(__DIR__.'/gh17518.phar.php');
?>
--EXPECTF--
PharException: phar error: attempted to extract non-existent file or directory "" from phar "%sgh17518.phar.php"
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