Synopsis

(Advisory) Functions which are designed to provide operations on a resource should be called in an appropriate sequence. A struct field is deallocated without first having been allocated. This might cause a runtime error.

Enabled by default

No

Severity/Certainty

Medium/Medium

Full description

A struct field is deallocated without first having been allocated.

Coding standards

Code examples

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

#include <stdlib.h>

struct test {
  int *a;
};

void example(void) {
  struct test t;
  free(t.a);
}

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

#include <stdlib.h>

struct test {
  int *a;
};

void example(void) {
  struct test t;
  t.a = malloc(sizeof(int));
  free(t.a);
}