Synopsis

A file pointer is never closed.

Enabled by default

Yes

Severity/Certainty

High/Medium

Full description

One or more file pointers are never closed. To avoid failure caused by resource exhaustion, all file pointers obtained dynamically by means of Standard Library functions must be explicitly released. Releasing them as soon as possible reduces the risk that exhaustion will occur. This check is identical to MISRAC2012-Dir-4.13_c, MISRAC2012-Rule-22.1_b, SEC-FILEOP-open-no-close, CERT-FIO42-C_a.

Coding standards

Code examples

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

#include <stdio.h>

void example(void) {
  FILE *fp = fopen("test.txt", "c");
}

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

#include <stdio.h>

void example(void) {
  FILE *fp = fopen("test.txt", "c");
  fclose(fp);
}