status_t NuPlayer::GenericSource::initFromDataSource() {
    sp<MediaExtractor> extractor;
 String8 mimeType;
 float confidence;
    sp<AMessage> dummy;
 bool isWidevineStreaming = false;

    CHECK(mDataSource != NULL);

 if (mIsWidevine) {
        isWidevineStreaming = SniffWVM(
                mDataSource, &mimeType, &confidence, &dummy);
 if (!isWidevineStreaming ||
                strcasecmp(
                    mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM)) {
            ALOGE("unsupported widevine mime: %s", mimeType.string());
 return UNKNOWN_ERROR;
 }
 } else if (mIsStreaming) {
 if (!mDataSource->sniff(&mimeType, &confidence, &dummy)) {
 return UNKNOWN_ERROR;
 }
        isWidevineStreaming = !strcasecmp(
                mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM);
 }

 if (isWidevineStreaming) {
        mCachedSource.clear();
        mDataSource = mHttpSource;
        mWVMExtractor = new WVMExtractor(mDataSource);
        mWVMExtractor->setAdaptiveStreamingMode(true);
 if (mUIDValid) {
            mWVMExtractor->setUID(mUID);
 }
        extractor = mWVMExtractor;
 } else {
        extractor = MediaExtractor::Create(mDataSource,
                mimeType.isEmpty() ? NULL : mimeType.string());
 }

 if (extractor == NULL) {
 return UNKNOWN_ERROR;
 }

 if (extractor->getDrmFlag()) {
        checkDrmStatus(mDataSource);
 }

    mFileMeta = extractor->getMetaData();
 if (mFileMeta != NULL) {
 int64_t duration;
 if (mFileMeta->findInt64(kKeyDuration, &duration)) {
            mDurationUs = duration;
 }

 if (!mIsWidevine) {
 const char *fileMime;
 if (mFileMeta->findCString(kKeyMIMEType, &fileMime)
 && !strncasecmp(fileMime, "video/wvm", 9)) {
                mIsWidevine = true;
 }
 }
 }

 int32_t totalBitrate = 0;

 size_t numtracks = extractor->countTracks();
 if (numtracks == 0) {
 return UNKNOWN_ERROR;
 }

 for (size_t i = 0; i < numtracks; ++i) {
        sp<MediaSource> track = extractor->getTrack(i);
 if (track == NULL) {
 continue;
 }

        sp<MetaData> meta = extractor->getTrackMetaData(i);

 const char *mime;
        CHECK(meta->findCString(kKeyMIMEType, &mime));

 if (!strncasecmp(mime, "audio/", 6)) {
 if (mAudioTrack.mSource == NULL) {
                mAudioTrack.mIndex = i;
                mAudioTrack.mSource = track;
                mAudioTrack.mPackets =
 new AnotherPacketSource(mAudioTrack.mSource->getFormat());

 if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_VORBIS)) {
                    mAudioIsVorbis = true;
 } else {
                    mAudioIsVorbis = false;
 }
 }
 } else if (!strncasecmp(mime, "video/", 6)) {
 if (mVideoTrack.mSource == NULL) {
                mVideoTrack.mIndex = i;
                mVideoTrack.mSource = track;
                mVideoTrack.mPackets =
 new AnotherPacketSource(mVideoTrack.mSource->getFormat());

 int32_t secure;
 if (meta->findInt32(kKeyRequiresSecureBuffers, &secure)
 && secure) {
                    mIsSecure = true;
 if (mUIDValid) {
                        extractor->setUID(mUID);
 }
 }
 }
 }

        mSources.push(track);
 int64_t durationUs;
 if (meta->findInt64(kKeyDuration, &durationUs)) {
 if (durationUs > mDurationUs) {
                mDurationUs = durationUs;
 }
 }

 int32_t bitrate;
 if (totalBitrate >= 0 && meta->findInt32(kKeyBitRate, &bitrate)) {
            totalBitrate += bitrate;
 } else {
            totalBitrate = -1;
 }
 }

 if (mSources.size() == 0) {
        ALOGE("b/23705695");
 return UNKNOWN_ERROR;
 }

    mBitrate = totalBitrate;

 return OK;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.