bug symfony#52443 [Yaml] Fix uid binary parsing (mRoca)

This PR was merged into the 5.4 branch.

Discussion
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[Yaml] Fix uid binary parsing

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| License       | MIT

Currently, on SF 5.4 & 6.4, a YAML file containing `{ uid: !!binary Ju0Yh+uqSXOagJZFTlUt8g== }` cannot be parsed because of a `preg_match` error: `Malformed UTF-8 characters, possibly incorrectly encoded`.

This is because `preg_match` should not be run over a binary string, but this specific binary string matches the following tests : `\is_string($value) && '' !== $value && '&' === $value[0]` (the string starts with `0x26` , which is the UTF-8 `&` char).

Commits
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ce3e282 [Yaml] Fix uid binary parsing

Author: fabpot

src/Symfony/Component/Yaml/Inline.php

@@ -531,7 +531,7 @@ private static function parseMapping(string $mapping, int $flags, int &$i = 0, a
                         if ('<<' === $key) {
                             $output += $value;
                         } elseif ($allowOverwrite || !isset($output[$key])) {
-                            if (!$isValueQuoted && \is_string($value) && '' !== $value && '&' === $value[0] && Parser::preg_match(Parser::REFERENCE_PATTERN, $value, $matches)) {
+                            if (!$isValueQuoted && \is_string($value) && '' !== $value && '&' === $value[0] && !self::isBinaryString($value) && Parser::preg_match(Parser::REFERENCE_PATTERN, $value, $matches)) {
                                 $references[$matches['ref']] = $matches['value'];
                                 $value = $matches['value'];
                             }

src/Symfony/Component/Yaml/Tests/InlineTest.php

@@ -368,6 +368,9 @@ public static function getTestsForParse()
 
             ['[foo, bar: { foo: bar }]', ['foo', '1' => ['bar' => ['foo' => 'bar']]]],
             ['[foo, \'@foo.baz\', { \'%foo%\': \'foo is %foo%\', bar: \'%foo%\' }, true, \'@service_container\']', ['foo', '@foo.baz', ['%foo%' => 'foo is %foo%', 'bar' => '%foo%'], true, '@service_container']],
+
+            // Binary string not utf8-compliant but starting with and utf8-equivalent "&" character
+            ['{ uid: !!binary Ju0Yh+uqSXOagJZFTlUt8g== }', ['uid' => hex2bin('26ed1887ebaa49739a8096454e552df2')]],
         ];
     }