fix unsafe ops

Author: zeriyoshi

ext/random/random.c

@@ -603,6 +603,11 @@ static uint64_t user_generate(void *state) {
 
 	/* Store generated size in a state */
 	size = Z_STR(retval)->len;
+
+	/* Guard for over 64-bit results */
+	if (size > sizeof(uint64_t)) {
+		size = sizeof(uint64_t);
+	}
 	s->last_generate_size = size;
 
 	if (size > 0) {

ext/random/tests/randomizer/get_bytes.phpt

@@ -16,6 +16,7 @@ $randomizer = new \Random\Randomizer (
                 2 => 'l',
                 3 => 'l',
                 4 => 'o',
+                5 => \random_bytes(32), // 128-bit
             };
         }
     }
@@ -25,6 +26,8 @@ if ($randomizer->getBytes(5) !== 'Hello') {
     die('failure');
 }
 
+$randomizer->getBytes(6);
+
 die('success');
 ?>
 --EXPECTF--