V2538. MISRA. The value of uninitialized variable should not be used.


This diagnostic rule is based on the software development guidelines developed by MISRA (Motor Industry Software Reliability Association).

If a variable of a POD type isn't initialized explicitly and doesn't have an initializer by default, its value will be undefined. Usage of such value will lead to undefined behavior.

Simple synthetic example:

int Aa = Get();
int Ab;
if (Ab) // Ab - uninitialized variable
  Ab = Foo();
else
  Ab = 0;

Usually errors of using uninitialized variables occur through misprints. For example, it may appear that a different variable should be used in this place. Correct code variant:

int Aa = Get();
int Ab;
if (Aa) // OK
  Ab = Foo();
else
  Ab = 0;

According to Common Weakness Enumeration, potential errors found by using this diagnostic are classified as CWE-457, CWE-824.


Bugs Found

Checked Projects
344
Collected Errors
12 970