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IAR Embedded Workbench for RL78 5.20

CERT-DCL30-C_d

In this section:
Synopsis

Declare objects with appropriate storage durations.

Enabled by default

Yes

Severity/Certainty

High/High

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Full description

Every object has a storage duration that determines its lifetime: static, thread, automatic, or allocated. Do not attempt to access an object outside of its lifetime. Attempting to do so is undefined behavior and can lead to an exploitable vulnerability. This check is identical to MEM-stack-global-field, MISRAC++2008-7-5-2_b, MISRAC++2023-6.8.3_b, MISRAC2004-17.6_c, MISRAC2012-Rule-18.6_c.

Coding standards
CERT DCL30-C

Declare objects with appropriate storage durations

MISRA C:2004 17.6

(Required) The address of an object with automatic storage shall not be assigned to another object that may persist after the first object has ceased to exist.

MISRA C:2012 Rule-18.6

(Required) The address of an object with automatic storage shall not be copied to another object that persists after the first object has ceased to exist

MISRA C++ 2008 7-5-2

(Required) The address of an object with automatic storage shall not be assigned to another object that may persist after the first object has ceased to exist.

MISRA C++ 2023 6.8.3

(Required) An assignment operator shall not assign the address of an object with automatic storage duration to an object with a greater lifetime

Code examples

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

struct S{
  int *px;
} s;

void example() {
  int i = 0;
  s.px = &i; //storing local address in global struct
}

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

#include <stdlib.h>

struct S{
  int *px;
} s;

void example() {
  int i = 0;
  s.px = &i; //OK - the field is written to later
  s.px = NULL;
}