Synopsis

(Mandatory) The value of an object with automatic storage duration shall not be read before it has been set.

Enabled by default

Yes

Severity/Certainty

Low/High

Full description

A possible dereference of an uninitialized or NULL pointer was found. This check is identical to PTR-uninit-pos, CERT-EXP33-C_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
}