[Intl] fix #39100

bahram · bahram · commit 8f96c7a8c871 · 2021-02-12T14:29:07.000+03:30
locale_parse returns null if `$locale` length is greater than `INTL_MAX_LOCALE_LEN`.
return null if locale_parse return null.
diff --git a/src/Symfony/Component/Intl/Locale.php b/src/Symfony/Component/Intl/Locale.php
@@ -69,6 +69,11 @@ public static function getFallback(string $locale): ?string
     {
         if (\function_exists('locale_parse')) {
             $localeSubTags = locale_parse($locale);
+
+            if (null === $localeSubTags) {
+                return null;
+            }
+
             if (1 === \count($localeSubTags)) {
                 if ('root' !== self::$defaultFallback && self::$defaultFallback === $localeSubTags['language']) {
                     return 'root';
diff --git a/src/Symfony/Component/Intl/Tests/LocaleTest.php b/src/Symfony/Component/Intl/Tests/LocaleTest.php
@@ -70,4 +70,13 @@ public function testDefaultRootFallback()
 
         Locale::setDefaultFallback($prev);
     }
+
+    public function testGetFallbackLongLocale()
+    {
+        $longLocale = 'LC_TYPE=fr_FR.UTF-8;LC_NUMERIC=C;LC_TIME=fr_FR.UTF-8;LC_COLLATE=fr_FR.UTF-8;'
+            . 'LC_MONETARY=fr_FR.UTF-8;LC_MESSAGES=fr_FR.UTF-8;LC_PAPER=fr_FR.UTF-8;LC_NAME=fr_FR.UTF-8;'
+            . 'LC_ADDRESS=fr_FR.UTF-8;LC_TELEPHONE=fr_FR.UTF-8;LC_MEASUREMENT=fr_FR.UTF-8;LC_IDENTIFICATION=fr_FR.UTF-8';
+
+        $this->assertNull(Locale::getFallback($longLocale));
+    }
 }

Original file line number	Diff line number	Diff line change
`@@ -70,4 +70,13 @@ public function testDefaultRootFallback()`
`70`	`70`
`71`	`71`	`Locale::setDefaultFallback($prev);`
`72`	`72`	`}`
	`73`	`+`
	`74`	`+ public function testGetFallbackLongLocale()`
	`75`	`+ {`
	`76`	`+ $longLocale = 'LC_TYPE=fr_FR.UTF-8;LC_NUMERIC=C;LC_TIME=fr_FR.UTF-8;LC_COLLATE=fr_FR.UTF-8;'`
	`77`	`+ . 'LC_MONETARY=fr_FR.UTF-8;LC_MESSAGES=fr_FR.UTF-8;LC_PAPER=fr_FR.UTF-8;LC_NAME=fr_FR.UTF-8;'`
	`78`	`+ . 'LC_ADDRESS=fr_FR.UTF-8;LC_TELEPHONE=fr_FR.UTF-8;LC_MEASUREMENT=fr_FR.UTF-8;LC_IDENTIFICATION=fr_FR.UTF-8';`
	`79`	`+`
	`80`	`+ $this->assertNull(Locale::getFallback($longLocale));`
	`81`	`+ }`
`73`	`82`	`}`