diff --git a/media/libshmem/ShmemUtil.cpp b/media/libshmem/ShmemUtil.cpp
new file mode 100644
index 0000000..a6d047f
--- /dev/null
+++ b/media/libshmem/ShmemUtil.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "media/ShmemUtil.h"
+
+namespace android {
+namespace media {
+
+bool validateSharedFileRegion(const SharedFileRegion& shmem) {
+    // Size and offset must be non-negative.
+    if (shmem.size < 0 || shmem.offset < 0) {
+        return false;
+    }
+
+    uint64_t size = shmem.size;
+    uint64_t offset = shmem.offset;
+
+    // Must not wrap.
+    if (offset > offset + size) {
+        return false;
+    }
+
+    return true;
+}
+
+}  // namespace media
+}  // namespace android