diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index 6bb54bd..0d0a998 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -174,6 +174,9 @@
     // value, the user-supplied time scale will be used.
     void setTimeScale();
 
+    // Simple validation on the codec specific data
+    status_t checkCodecSpecificData() const;
+
     Track(const Track &);
     Track &operator=(const Track &);
 };
@@ -1624,6 +1627,8 @@
 
     if (mSampleSizes.empty()) {
         err = ERROR_MALFORMED;
+    } else if (OK != checkCodecSpecificData()) {
+        err = ERROR_MALFORMED;
     }
     mOwner->trackProgressStatus(this, -1, err);
 
@@ -1833,6 +1838,27 @@
     return mEstimatedTrackSizeBytes;
 }
 
+status_t MPEG4Writer::Track::checkCodecSpecificData() const {
+    const char *mime;
+    CHECK(mMeta->findCString(kKeyMIMEType, &mime));
+    if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_AAC, mime) ||
+        !strcasecmp(MEDIA_MIMETYPE_VIDEO_MPEG4, mime) ||
+        !strcasecmp(MEDIA_MIMETYPE_VIDEO_AVC, mime)) {
+        if (!mCodecSpecificData ||
+            mCodecSpecificDataSize <= 0) {
+            // Missing codec specific data
+            return ERROR_MALFORMED;
+        }
+    } else {
+        if (mCodecSpecificData ||
+            mCodecSpecificDataSize > 0) {
+            // Unexepected codec specific data found
+            return ERROR_MALFORMED;
+        }
+    }
+    return OK;
+}
+
 void MPEG4Writer::Track::writeTrackHeader(
         int32_t trackID, bool use32BitOffset) {
     const char *mime;