diff --git a/services/core/java/com/android/server/pm/SELinuxMMAC.java b/services/core/java/com/android/server/pm/SELinuxMMAC.java
index 89705560db7df..7d4532f18dddb 100644
--- a/services/core/java/com/android/server/pm/SELinuxMMAC.java
+++ b/services/core/java/com/android/server/pm/SELinuxMMAC.java
@@ -331,9 +331,8 @@ public final class SELinuxMMAC {
         }
 
         try {
-            final byte[] buf = new byte[20];
-            final int len = Os.getxattr(file.getAbsolutePath(), XATTR_SEAPP_HASH, buf);
-            if ((len == 20) && Arrays.equals(SEAPP_CONTEXTS_HASH, buf)) {
+            final byte[] buf = Os.getxattr(file.getAbsolutePath(), XATTR_SEAPP_HASH);
+            if ((buf.length == 20) && Arrays.equals(SEAPP_CONTEXTS_HASH, buf)) {
                 return false;
             }
         } catch (ErrnoException e) {
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index c9ad49a565c14..0ac8407bbbe00 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -3023,9 +3023,8 @@ public class UserManagerService extends IUserManager.Stub {
      */
     private static int getSerialNumber(File file) throws IOException {
         try {
-            final byte[] buf = new byte[256];
-            final int len = Os.getxattr(file.getAbsolutePath(), XATTR_SERIAL, buf);
-            final String serial = new String(buf, 0, len);
+            final byte[] buf = Os.getxattr(file.getAbsolutePath(), XATTR_SERIAL);
+            final String serial = new String(buf);
             try {
                 return Integer.parseInt(serial);
             } catch (NumberFormatException e) {