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V558. Function returns pointer/referenc…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
Additional information
Contents

V558. Function returns pointer/reference to temporary local object.

Jun 12 2012

The analyzer detected an issue when a function returns a pointer to a local object. This object will be destroyed when leaving the function, so you will not be able to use the pointer to it anymore.

In a most common case, this diagnostic message is generated against the following code:

float *F()
{
  float f = 1.0;
  return &f;
}

Of course, the error would hardly be present in such a form in real code. Let's consider a more real example.

int *Foo()
{
  int A[10];
  // ...
  if (err)
    return 0;
  
  int *B = new int[10];
  memcpy(B, A, sizeof(A));

  return A;
}

Here, we handled the temporary array A. On some condition, we must return the pointer to the new array B. But the misprint causes the A array to be returned, which will cause unexpected behavior of the program or crash. This is the correct code:

int *Foo()
{
  ...  
  int *B = new int[10];
  memcpy(B, A, sizeof(A));
  return B;
}

This diagnostic is classified as:

You can look at examples of errors detected by the V558 diagnostic.

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