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IAR Embedded Workbench for Arm 9.70.x

ATH-div-0-pos

In this section:
Synopsis

Interval analysis has found an expression that might be 0 and is used as a divisor.

Enabled by default

Yes

Severity/Certainty

High/Low

highlow.png
Full description

Interval analysis has found an expression that contains 0 and is used as a divisor. This might cause a 'divide by zero' runtime error. This check is identical to MISRAC2004-1.2_h, MISRAC2012-Rule-1.3_f, CERT-INT33-C_e.

Coding standards
CERT INT33-C

Ensure that division and modulo operations do not result in divide-by-zero errors

CWE 369

Divide By Zero

MISRA C:2004 1.2

(Required) No reliance shall be placed on undefined or unspecified behavior.

MISRA C:2012 Rule-1.3

(Required) There shall be no occurrence of undefined or critical unspecified behaviour

Code examples

The following code example fails the check and will give a warning:

int foo(void)
{
  int a = 3;
  a--;
  return 5 / (a-2);  // a-2 is 0
}

The following code example passes the check and will not give a warning about this issue:

int foo(void)
{
  int a = 3;
  a--;
  return 5 / (a+2);  // OK - a+2 is 4
}