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IAR Embedded Workbench for RISC-V 3.40

ATH-div-0-assign

In this section:
Synopsis

A variable is assigned the value 0, then used as a divisor.

Enabled by default

Yes

Severity/Certainty

High/High

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Full description

A variable is assigned the value 0, then used as a divisor. This will cause a 'divide by zero' runtime error. This check is identical to MISRAC2004-1.2_d, MISRAC2012-Rule-1.3_b, CERT-INT33-C_a.

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 = 20, b = 0, c;

  c = a / b;    /* Divide by zero */

  return c;
}

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

int foo(void)
{
  int a = 20, b = 5, c;

  c = a / b; /* b is not 0 */

  return c;
}