static sds cliFormatReplyCSV(redisReply *r) {
    unsigned int i;

    sds out = sdsempty();
    switch (r->type) {
    case REDIS_REPLY_ERROR:
        out = sdscat(out,"ERROR,");
        out = sdscatrepr(out,r->str,strlen(r->str));
    break;
    case REDIS_REPLY_STATUS:
        out = sdscatrepr(out,r->str,r->len);
    break;
    case REDIS_REPLY_INTEGER:
        out = sdscatprintf(out,"%lld",r->integer);
    break;
    case REDIS_REPLY_STRING:
        out = sdscatrepr(out,r->str,r->len);
    break;
    case REDIS_REPLY_NIL:
        out = sdscat(out,"NIL");
    break;
    case REDIS_REPLY_ARRAY:
        for (i = 0; i < r->elements; i++) {
            sds tmp = cliFormatReplyCSV(r->element[i]);
            out = sdscatlen(out,tmp,sdslen(tmp));
            if (i != r->elements-1) out = sdscat(out,",");
            sdsfree(tmp);
        }
    break;
    default:
        fprintf(stderr,"Unknown reply type: %d\n", r->type);
        exit(1);
    }
    return out;
}

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.