MATH.DOMAIN.POW : Undefined Power of Zero

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CodeSonar^® 9.2p0

CONFIDENTIAL

CodeSecure Inc

MATH.DOMAIN.POW : Undefined Power of Zero

要旨

累乗関数の底を指定する引数に0を入力し、かつ、指数を指定する引数を値を0もしくは負値とした状態で、累乗関数pow()が呼び出されました。

プロパティ

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

CodeSonar ships with library models that allow it to 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.

例

#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;
}

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