static void unregister_shm(struct thread_smc_args *smc_args,
			   struct optee_msg_arg *arg, uint32_t num_params)
{
	if (num_params == 1) {
		uint64_t cookie = arg->params[0].u.rmem.shm_ref;
		TEE_Result res = mobj_reg_shm_release_by_cookie(cookie);

		if (res)
			EMSG("Can't find mapping with given cookie");
		arg->ret = res;
	} else {
		arg->ret = TEE_ERROR_BAD_PARAMETERS;
		arg->ret_origin = TEE_ORIGIN_TEE;
	}

	smc_args->a0 = OPTEE_SMC_RETURN_OK;
}

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.