MATH.DOMAIN.POW : Undefined Power of Zero

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CodeSonar^® 9.2p0

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CodeSecure Inc

MATH.DOMAIN.POW : Undefined Power of Zero

Summary

A power function is called with zero in the "base" argument position and zero or a negative value in the "exponent" argument position.

Properties

MisraC2025

MisraC2025:D.4.11

The validity of values passed to library functions shall be checked

MisraC2023

MisraC2023:D.4.11

The validity of values passed to library functions shall be checked

Misra2012

Misra2012:D.4.11

The validity of values passed to library functions shall be checked

Misra2004

Misra2004:20.3

The validity of values passed to library functions shall be checked

AUTOSARC++14

AUTOSARC++14:A0-4-4

Range, domain and pole errors shall be checked when using math functions.

MisraC++2023

MisraC++2023:0.3.2

A function call shall not violate the function's preconditions

CWE

CWE:628

Function Call with Incorrectly Specified Arguments

CWE:687

Function Call With Incorrectly Specified Argument Value

CWE:688

Function Call With Incorrect Variable or Reference as Argument

CERT-C

CERT-C:FLP32-C

Prevent or detect domain and range errors in math functions

Insecure design

Insecure Design

Triggers

CodeSonar ships with library models that allow it to recognize functions such as libm pow() that compute a power. If one of these functions is called with zero in the "base" parameter position and zero or a negative value in the "power" parameter position, a warning will be issued.

If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Undefined Power of Zero warnings.

Example

#include <math.h>

double call_pow(double base, double exp){
    double a = pow(1,1);                           /* ok: base and exponent both > 0 */
    double b = pow(0,5);                           /* ok: exponent > 0 */
    double c = pow(0,-1);      /* 'Undefined Power of Zero' warning issued here */
    double d = pow(base,-1);            /* EVIDENCED ONLY: 'Undefined Power of Zero' warning issued here
                                         * if CodeSonar has evidence that call_pow() is called with a value ==0 as the first argument. */
    double e = pow(0,exp);     /* 'Undefined Power of Zero' warning issued here */
    double f = pow(base,exp);           /* EVIDENCED ONLY: 'Undefined Power of Zero' warning issued here
                                         * if CodeSonar has evidence that call_pow() is called with a value ==0 as the first argument. */

    return a+b+c+d+e+f;
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.