diff --git a/include/media/mediametadataretriever.h b/include/media/mediametadataretriever.h
index 0df77c1..1acfac3 100644
--- a/include/media/mediametadataretriever.h
+++ b/include/media/mediametadataretriever.h
@@ -77,7 +77,7 @@
     const char* extractMetadata(int keyCode);
 
 private:
-    static const sp<IMediaPlayerService>& getService();
+    static const sp<IMediaPlayerService> getService();
 
     class DeathNotifier: public IBinder::DeathRecipient
     {
diff --git a/media/libmedia/mediametadataretriever.cpp b/media/libmedia/mediametadataretriever.cpp
index 110b94c..0857461 100644
--- a/media/libmedia/mediametadataretriever.cpp
+++ b/media/libmedia/mediametadataretriever.cpp
@@ -32,7 +32,7 @@
 sp<IMediaPlayerService> MediaMetadataRetriever::sService;
 sp<MediaMetadataRetriever::DeathNotifier> MediaMetadataRetriever::sDeathNotifier;
 
-const sp<IMediaPlayerService>& MediaMetadataRetriever::getService()
+const sp<IMediaPlayerService> MediaMetadataRetriever::getService()
 {
     Mutex::Autolock lock(sServiceLock);
     if (sService == 0) {
@@ -59,7 +59,7 @@
 MediaMetadataRetriever::MediaMetadataRetriever()
 {
     ALOGV("constructor");
-    const sp<IMediaPlayerService>& service(getService());
+    const sp<IMediaPlayerService> service(getService());
     if (service == 0) {
         ALOGE("failed to obtain MediaMetadataRetrieverService");
         return;
diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index 5d8be84..c66cd5f 100644
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -3379,7 +3379,15 @@
                     continue;
                 }
 
-                CHECK(dstOffset + 4 <= mBuffer->size());
+                if (dstOffset > SIZE_MAX - 4 ||
+                        dstOffset + 4 > SIZE_MAX - nalLength ||
+                        dstOffset + 4 + nalLength > mBuffer->size()) {
+                    ALOGE("b/27208621 : %zu %zu", dstOffset, mBuffer->size());
+                    android_errorWriteLog(0x534e4554, "27208621");
+                    mBuffer->release();
+                    mBuffer = NULL;
+                    return ERROR_MALFORMED;
+                }
 
                 dstData[dstOffset++] = 0;
                 dstData[dstOffset++] = 0;