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Fix GH-17047: UAF on iconv filter failure #17058

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Fix GH-17047: UAF on iconv filter failure #17058

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11 changes: 3 additions & 8 deletions ext/iconv/iconv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2536,7 +2536,8 @@ static php_stream_filter_status_t php_iconv_stream_filter_do_filter(
if (php_iconv_stream_filter_append_bucket(self, stream, filter,
buckets_out, bucket->buf, bucket->buflen, &consumed,
php_stream_is_persistent(stream)) != SUCCESS) {
goto out_failure;
php_stream_bucket_delref(bucket);
return PSFS_ERR_FATAL;
}

php_stream_bucket_delref(bucket);
Expand All @@ -2546,7 +2547,7 @@ static php_stream_filter_status_t php_iconv_stream_filter_do_filter(
if (php_iconv_stream_filter_append_bucket(self, stream, filter,
buckets_out, NULL, 0, &consumed,
php_stream_is_persistent(stream)) != SUCCESS) {
goto out_failure;
return PSFS_ERR_FATAL;
}
}

Expand All @@ -2555,12 +2556,6 @@ static php_stream_filter_status_t php_iconv_stream_filter_do_filter(
}

return PSFS_PASS_ON;

out_failure:
if (bucket != NULL) {
php_stream_bucket_delref(bucket);
}
return PSFS_ERR_FATAL;
}
/* }}} */

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17 changes: 17 additions & 0 deletions ext/iconv/tests/gh17047.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
--TEST--
GH-17047 (UAF on iconv filter failure)
--EXTENSIONS--
iconv
--FILE--
<?php
$stream = fopen('php://temp', 'w+');
stream_filter_append($stream, 'convert.iconv.UTF-16BE.UTF-8');
stream_filter_append($stream, 'convert.iconv.UTF-16BE.UTF-16BE');
fputs($stream, 'test');
rewind($stream);
var_dump(stream_get_contents($stream));
fclose($stream);
?>
--EXPECTF--
Warning: stream_get_contents(): iconv stream filter ("UTF-16BE"=>"UTF-16BE"): invalid multibyte sequence in %s on line %d
string(0) ""
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