Synopsis

(Required) All automatic variables shall have been assigned a value before being used.

Enabled by default

Yes

Severity/Certainty

High/Medium

Full description

An uninitialized or NULL pointer that is dereferenced was found. This check is identical to PTR-uninit, MISRAC++2008-8-5-1_c.

Coding standards

Code examples

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

void example(void) {
  int *p;
  *p = 4;  //p is uninitialized
}

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

void example(void) {
  int *p,a;
  p = &a;
  *p = 4;  //OK - p holds a valid address
}