To get a trial key
fill out the form below
Team License (standard version)
Enterprise License (extended version)
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Request our prices
New License
License Renewal
--Select currency--
USD
EUR
GBP
RUB
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
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

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
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

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
I am interested to try it on the platforms:
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Message submitted.

Your message has been sent. We will email you at


If you haven't received our response, please do the following:
check your Spam/Junk folder and click the "Not Spam" button for our message.
This way, you won't miss messages from our team in the future.

>
>
>
V2598. MISRA. Variable length array typ…
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
Additional information
Contents

V2598. MISRA. Variable length array types are not allowed.

Jul 12 2021

This diagnostic rule is based on the MISRA (Motor Industry Software Reliability Association) manual for software development.

This rule only applies to C.

Declaring variable-length arrays can lead to a stack overflow and potential vulnerabilities in the program.

Consider the example:

void foo(size_t n)
{
  int arr[n];
  // ....
}

Transmission of large number 'n' can lead to a stack overflow as the array will become too large and take up more memory than it really is.

The most logical way is to limit the size of the array:

#define MAX_SIZE 128
void foo(size_t n)
{
  size_t size = n > MAX_SIZE ? MAX_SIZE : n;
  int arr[size];
  if (size < n) // error
  // ....
}

However, in this case it is better to use a constant to simplify the logic of the program:

#define SIZE 128
void foo()
{
  int arr[size];
  // ....
}

This will also help to avoid VLA-connected problems like calculating 'sizeof' on such arrays and passing them to other functions.

This diagnostic is classified as:

  • MISRA-C-18.8
This website uses cookies and other technology to provide you a more personalized experience. By continuing the view of our web-pages you accept the terms of using these files. If you don't want your personal data to be processed, please, leave this site.
Learn More →
Accept