diff --git a/media/libmediaplayer2/nuplayer2/NuPlayer2CCDecoder.cpp b/media/libmediaplayer2/nuplayer2/NuPlayer2CCDecoder.cpp
index e48e388..e215965 100644
--- a/media/libmediaplayer2/nuplayer2/NuPlayer2CCDecoder.cpp
+++ b/media/libmediaplayer2/nuplayer2/NuPlayer2CCDecoder.cpp
@@ -372,10 +372,16 @@
                             timeUs, mDTVCCPacket->data(), mDTVCCPacket->size());
                     mDTVCCPacket->setRange(0, 0);
                 }
+                if (mDTVCCPacket->size() + 2 > mDTVCCPacket->capacity()) {
+                    return false;
+                }
                 memcpy(mDTVCCPacket->data() + mDTVCCPacket->size(), br.data(), 2);
                 mDTVCCPacket->setRange(0, mDTVCCPacket->size() + 2);
                 br.skipBits(16);
             } else if (mDTVCCPacket->size() > 0 && cc_type == 2) {
+                if (mDTVCCPacket->size() + 2 > mDTVCCPacket->capacity()) {
+                    return false;
+                }
                 memcpy(mDTVCCPacket->data() + mDTVCCPacket->size(), br.data(), 2);
                 mDTVCCPacket->setRange(0, mDTVCCPacket->size() + 2);
                 br.skipBits(16);
@@ -403,6 +409,9 @@
                         line21CCBuf = new ABuffer((cc_count - i) * sizeof(CCData));
                         line21CCBuf->setRange(0, 0);
                     }
+                    if (line21CCBuf->size() + sizeof(cc) > line21CCBuf->capacity()) {
+                        return false;
+                    }
                     memcpy(line21CCBuf->data() + line21CCBuf->size(), &cc, sizeof(cc));
                     line21CCBuf->setRange(0, line21CCBuf->size() + sizeof(CCData));
                 }
@@ -464,6 +473,9 @@
             size_t trackIndex = getTrackIndex(kTrackTypeCEA708, service_number, &trackAdded);
             if (mSelectedTrack == (ssize_t)trackIndex) {
                 sp<ABuffer> ccPacket = new ABuffer(block_size);
+                if (ccPacket->capacity() == 0) {
+                    return false;
+                }
                 memcpy(ccPacket->data(), br.data(), block_size);
                 mCCMap.add(timeUs, ccPacket);
             }
@@ -527,10 +539,12 @@
         ccBuf = new ABuffer(size);
         ccBuf->setRange(0, 0);
 
-        for (ssize_t i = 0; i <= index; ++i) {
-            sp<ABuffer> buf = mCCMap.valueAt(i);
-            memcpy(ccBuf->data() + ccBuf->size(), buf->data(), buf->size());
-            ccBuf->setRange(0, ccBuf->size() + buf->size());
+        if (ccBuf->capacity() > 0) {
+            for (ssize_t i = 0; i <= index; ++i) {
+                sp<ABuffer> buf = mCCMap.valueAt(i);
+                memcpy(ccBuf->data() + ccBuf->size(), buf->data(), buf->size());
+                ccBuf->setRange(0, ccBuf->size() + buf->size());
+            }
         }
     }