api: Fix boundary check in Status.fromCodeValue() (#10155)

Author: temawi

api/src/main/java/io/grpc/Status.java

@@ -307,7 +307,7 @@ private static List<Status> buildStatusList() {
    * Return a {@link Status} given a canonical error {@link Code} value.
    */
   public static Status fromCodeValue(int codeValue) {
-    if (codeValue < 0 || codeValue > STATUS_LIST.size()) {
+    if (codeValue < 0 || codeValue >= STATUS_LIST.size()) {
       return UNKNOWN.withDescription("Unknown code " + codeValue);
     } else {
       return STATUS_LIST.get(codeValue);

api/src/test/java/io/grpc/StatusTest.java

@@ -43,6 +43,7 @@ public void verifyExceptionMessage() {
   @Test
   public void impossibleCodeValue() {
     assertEquals(Code.UNKNOWN, Status.fromCodeValue(-1).getCode());
+    assertEquals(Code.UNKNOWN, Status.fromCodeValue(17).getCode());
   }
 
   @Test