static TEE_Result AuthVarGet()

in TAs/optee_ta/AuthVars/AuthVars.c [131:173]

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

static TEE_Result AuthVarGet(
    uint32_t    ParamTypes,
    TEE_Param   Params[4]
)
{
    VARIABLE_GET_PARAM  *GetParam;
    VARIABLE_GET_RESULT *GetResult;
    uint32_t    GetParamSize;
    uint32_t    GetResultSize;
    uint32_t    ExpectedTypes;
    TEE_Result  Status;

    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) {
        DMSG("AuthVarGet: bad param types");
        return TEE_ERROR_BAD_PARAMETERS;
    }

    GetParam = (VARIABLE_GET_PARAM *)Params[0].memref.buffer;
    GetParamSize = Params[0].memref.size;

    GetResult = (VARIABLE_GET_RESULT *)Params[1].memref.buffer;
    GetResultSize = Params[1].memref.size;

    // Call VarOps
    Status = GetVariable(GetParamSize, GetParam, &GetResultSize, GetResult);
    DMSG("Get result 0x%x size: 0x%x", Status, GetResultSize);

    // 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.a = GetResultSize;
    Params[2].value.b = Status;

    return Status;
}