int check_codec_match(LayeredAVStream *ccf, AVStream *ccs, int stream)
{
    int matches = 1;

/* FIXME: Missed check on AVCodecContext.flags */
#define CHECK_CODEC(x)  (ccf->codecpar->x != ccs->codecpar->x)
    if (CHECK_CODEC(codec_id) || CHECK_CODEC(codec_type)) {
        http_log("Codecs do not match for stream %d\n", stream);
        matches = 0;
    } else if (CHECK_CODEC(bit_rate)) {
        http_log("Codec bitrates do not match for stream %d\n", stream);
        matches = 0;
    } else if (ccf->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
        if (av_cmp_q(ccf->time_base, ccs->time_base) ||
            CHECK_CODEC(width) || CHECK_CODEC(height)) {
            http_log("Codec width, height or framerate do not match for stream %d\n", stream);
            matches = 0;
        }
    } else if (ccf->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
        if (CHECK_CODEC(sample_rate) ||
            CHECK_CODEC(channels) ||
            CHECK_CODEC(frame_size)) {
            http_log("Codec sample_rate, channels, frame_size do not match for stream %d\n", stream);
            matches = 0;
        }
    } else {
        http_log("Unknown codec type for stream %d\n", stream);
        matches = 0;
    }

    return matches;
}

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.