int ff_h264_handle_aggregated_packet(AVFormatContext *ctx, PayloadContext *data, AVPacket *pkt,
                                     const uint8_t *buf, int len,
                                     int skip_between, int *nal_counters,
                                     int nal_mask)
{
    int pass         = 0;
    int total_length = 0;
    uint8_t *dst     = NULL;
    int ret;

    for (pass = 0; pass < 2; pass++) {
        const uint8_t *src = buf;
        int src_len        = len;

        while (src_len > 2) {
            uint16_t nal_size = AV_RB16(src);

            src     += 2;
            src_len -= 2;

            if (nal_size <= src_len) {
                if (pass == 0) {
                    total_length += sizeof(start_sequence) + nal_size;
                } else {
                    memcpy(dst, start_sequence, sizeof(start_sequence));
                    dst += sizeof(start_sequence);
                    memcpy(dst, src, nal_size);
                    if (nal_counters)
                        nal_counters[(*src) & nal_mask]++;
                    dst += nal_size;
                }
            } else {
                av_log(ctx, AV_LOG_ERROR,
                       "nal size exceeds length: %d %d\n", nal_size, src_len);
                return AVERROR_INVALIDDATA;
            }

            src     += nal_size + skip_between;
            src_len -= nal_size + skip_between;
        }

        if (pass == 0) {
            /* now we know the total size of the packet (with the
             * start sequences added) */
            if ((ret = av_new_packet(pkt, total_length)) < 0)
                return ret;
            dst = pkt->data;
        }
    }

    return 0;
}

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.