Synopsis

(Required) All variables shall have a defined value before they are used.

Enabled by default

Yes

Severity/Certainty

High/Medium

Full description

One or more uninitialized or NULL pointers are dereferenced. This check is identical to PTR-uninit, MISRAC2004-9.1_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
}