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private Object myState = null;

// Sets some internal state in the library
void setfile(Object state) {
  if (state == null) {
    // Handle null state
  }

  // Defensive copy here when state is mutable

  if (isInvalidState(state)) {
    // Handle invalid state
  }
  myState = state;
}

// Performs some action using the state passed earlier
void useState() {
  if (myState == null) {
    // Handle no state (e.g. null) condition
  }
  // ...
}

Exceptions

MET01MET00-EX0: Parameter validation inside a method may be omitted when the stated contract of a method requires that the caller must validate arguments passed to the method. In this case, the validation must be performed by the caller for all invocations of the method.

MET01MET00-EX1: Parameter validation may be omitted for parameters whose type adequately constrains the state of the parameter. This constraint should be clearly documented in the code.

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public int product(int x, int y) {
  long result = (long) x * y;
  if (result < Integer.MIN_VALUE || result > Integer.MAX_VALUE) {
    // handle error
  }
  return (int) result;
}

MET01MET00-EX2: Complete validation of all parameters of all methods may introduce added cost and complexity that exceeds its value for all but the most critical code. See, for example, NUM00-J. Detect or prevent integer overflow exception NUM00-EX2. In such cases, consider parameter validation at API boundaries, especially those that may involve interaction with untrusted code.

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Related Vulnerabilities

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