src/java.base/unix/native/libnet/net_util_md.c

@@ -93,12 +93,12 @@
     if (ni_class == NULL) {
         jclass c = (*env)->FindClass(env, "java/net/NetworkInterface");
         CHECK_NULL(c);
         c = (*env)->NewGlobalRef(env, c);
         CHECK_NULL(c);
-        ni_defaultIndexID = (*env)->GetStaticFieldID(
-            env, c, "defaultIndex", "I");
+        ni_defaultIndexID = (*env)->GetStaticFieldID(env, c, "defaultIndex", "I");
+        CHECK_NULL(ni_defaultIndexID);
         ni_class = c;
     }
     int defaultIndex;
     struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)him;
     if (sin6->sin6_family == AF_INET6 && (sin6->sin6_scope_id == 0)) {

@@ -116,12 +116,12 @@
     if (ni_class == NULL) {
         jclass c = (*env)->FindClass(env, "java/net/NetworkInterface");
         CHECK_NULL_RETURN(c, 0);
         c = (*env)->NewGlobalRef(env, c);
         CHECK_NULL_RETURN(c, 0);
-        ni_defaultIndexID = (*env)->GetStaticFieldID(env, c,
-                                                     "defaultIndex", "I");
+        ni_defaultIndexID = (*env)->GetStaticFieldID(env, c, "defaultIndex", "I");
+        CHECK_NULL_RETURN(ni_defaultIndexID, 0);
         ni_class = c;
     }
     defaultIndex = (*env)->GetStaticIntField(env, ni_class,
                                              ni_defaultIndexID);
     return defaultIndex;