static TEE_Result AuthVarQuery()

in TAs/optee_ta/AuthVars/AuthVars.c [265:307]

• 29 lines of code
• 2 McCabe index (conditional complexity)

static TEE_Result AuthVarQuery(
    uint32_t  ParamTypes,
    TEE_Param Params[4]
)
{
    VARIABLE_QUERY_PARAM    *QueryParam;
    VARIABLE_QUERY_RESULT   *QueryResult;
    uint32_t    QueryParamSize;
    uint32_t   *QueryResultSize;
    uint32_t    ExpectedTypes;
    TEE_Result  Status;

    DMSG("AV cmd");

    ExpectedTypes = TEE_PARAM_TYPES(
        TEE_PARAM_TYPE_MEMREF_INPUT,
        TEE_PARAM_TYPE_MEMREF_OUTPUT,
        TEE_PARAM_TYPE_VALUE_OUTPUT,
        TEE_PARAM_TYPE_NONE);

    // Validate parameter types
    if (ParamTypes != ExpectedTypes) {
        IMSG("AuthVarQuery: bad param types");
        return TEE_ERROR_BAD_PARAMETERS;
    }

    QueryParam = (VARIABLE_GET_NEXT_PARAM *)Params[0].memref.buffer;
    QueryParamSize = Params[0].memref.size;

    QueryResult = (VARIABLE_GET_RESULT *)Params[1].memref.buffer;
    QueryResultSize = &Params[1].memref.size;

    // Call VarOps
    Status = QueryVariableInfo(QueryParamSize, QueryParam, QueryResultSize, QueryResult);

    // Authvars driver expects TEE_SUCCESS, TEE_ERROR_SHORT_BUFFER,
    // or TEEC_ERROR_ITEM_NOT_FOUND as a return value. All other values
    // are handled as errors. Return values are also passed  back through
    // parameter 2b to be handled by the command specific part of the driver.
    Params[2].value.b = Status;

    return Status;
}