Synopsis

(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.

Enabled by default

Yes

Severity/Certainty

High/Medium

Full description

Detected a stack address in the field of a global struct. This check is identical to MISRAC++2023-6.8.3_b, MEM-stack-global-field, MISRAC2004-17.6_c, MISRAC2012-Rule-18.6_c, CERT-DCL30-C_d.

Coding standards

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;
}