void __weak tee_entry_std(struct thread_smc_args *smc_args)
{
	paddr_t parg;
	struct optee_msg_arg *arg = NULL;	/* fix gcc warning */
	uint32_t num_params = 0;		/* fix gcc warning */
	struct mobj *mobj;

	if (smc_args->a0 != OPTEE_SMC_CALL_WITH_ARG) {
		EMSG("Unknown SMC 0x%" PRIx64, (uint64_t)smc_args->a0);
		DMSG("Expected 0x%x\n", OPTEE_SMC_CALL_WITH_ARG);
		smc_args->a0 = OPTEE_SMC_RETURN_EBADCMD;
		return;
	}
	parg = (uint64_t)smc_args->a1 << 32 | smc_args->a2;

	/* Check if this region is in static shared space */
	if (core_pbuf_is(CORE_MEM_NSEC_SHM, parg,
			  sizeof(struct optee_msg_arg))) {
		mobj = get_cmd_buffer(parg, &num_params);
	} else {
		if (parg & SMALL_PAGE_MASK) {
			smc_args->a0 = OPTEE_SMC_RETURN_EBADADDR;
			return;
		}
		mobj = map_cmd_buffer(parg, &num_params);
	}

	if (!mobj || !ALIGNMENT_IS_OK(parg, struct optee_msg_arg)) {
		EMSG("Bad arg address 0x%" PRIxPA, parg);
		smc_args->a0 = OPTEE_SMC_RETURN_EBADADDR;
		mobj_free(mobj);
		return;
	}

	arg = mobj_get_va(mobj, 0);
	assert(arg && mobj_is_nonsec(mobj));

	/* Enable foreign interrupts for STD calls */
	thread_set_foreign_intr(true);
	switch (arg->cmd) {
	case OPTEE_MSG_CMD_OPEN_SESSION:
		entry_open_session(smc_args, arg, num_params);
		break;
	case OPTEE_MSG_CMD_CLOSE_SESSION:
		entry_close_session(smc_args, arg, num_params);
		break;
	case OPTEE_MSG_CMD_INVOKE_COMMAND:
		entry_invoke_command(smc_args, arg, num_params);
		break;
	case OPTEE_MSG_CMD_CANCEL:
		entry_cancel(smc_args, arg, num_params);
		break;
	case OPTEE_MSG_CMD_REGISTER_SHM:
		register_shm(smc_args, arg, num_params);
		break;
	case OPTEE_MSG_CMD_UNREGISTER_SHM:
		unregister_shm(smc_args, arg, num_params);
		break;

	default:
		EMSG("Unknown cmd 0x%x\n", arg->cmd);
		smc_args->a0 = OPTEE_SMC_RETURN_EBADCMD;
	}
	mobj_free(mobj);
}

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.