Our website uses cookies to enhance your browsing experience.
Accept
to the top
close form

Fill out the form in 2 simple steps below:

Your contact information:

Step 1
Congratulations! This is your promo code!

Desired license type:

Step 2
Team license
Enterprise license
** By clicking this button you agree to our Privacy Policy statement
close form
Request our prices
New License
License Renewal
--Select currency--
USD
EUR
* By clicking this button you agree to our Privacy Policy statement

close form
Free PVS‑Studio license for Microsoft MVP specialists
* By clicking this button you agree to our Privacy Policy statement

close form
To get the licence for your open-source project, please fill out this form
* By clicking this button you agree to our Privacy Policy statement

close form
I am interested to try it on the platforms:
* By clicking this button you agree to our Privacy Policy statement

close form
check circle
Message submitted.

Your message has been sent. We will email you at


If you do not see the email in your inbox, please check if it is filtered to one of the following folders:

  • Promotion
  • Updates
  • Spam

>
>
>
V1111. The index was used without check…
menu mobile close menu
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Micro-Optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
Customer specific requests (C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
Problems related to code analyzer
Additional information
toggle menu Contents

V1111. The index was used without check after it was checked in previous lines.

Aug 01 2024

The analyzer has detected a potential error that may cause an array index out of bounds. The code above contains index checks, but on the specified line, the container uses the index without any checks.

Let's look at a synthetic example:

#define SIZE 10
int buf[SIZE];

int do_something(int);

int some_bad_function(int idx)
{
  int res;

  if (idx < SIZE)
  {
    res = do_something(buf[idx]);
  }
  // ....
  res = do_something(buf[idx]); // <=
  return res;
}

In this example, if a value greater than or equal to 'SIZE' is passed to the function, an array index out of bounds will occur despite the check.

We need to add at least an extra check:

int some_good_function(int idx)
{
  int res;

  if (idx < SIZE)
  {
    res = do_something(buf[idx]);
  }
  // ....
  if (idx < SIZE)
  {
    res = do_something(buf[idx]); //ok
  }

  return res;
}

Note: the diagnostic rule implements several exceptions that are added to reduce the number of false positives. For the analyzer to issue a warning, the following conditions should be met:

  • The comparison should be made to a constant expression.
  • There should be no exit from the code block after the comparison.
  • Access by index should be done in a computable context.

This diagnostic is classified as: